|
Employee Benefit Plans - Fair Value of Plan Assets (Details) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2012
|
Dec. 31, 2011
|
Dec. 31, 2010
|
Dec. 31, 2009
|
||||
|---|---|---|---|---|---|---|---|---|
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | $ 21,729 | $ 20,244 | ||||||
|
Fair Value, Inputs, Level 1 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 10,870 | 9,863 | ||||||
|
Fair Value, Inputs, Level 2 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 10,042 | 9,642 | ||||||
|
Fair Value, Inputs, Level 3 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 817 | 739 | 672 | 670 | ||||
|
Limited Partnerships [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 341 | 337 | ||||||
|
Limited Partnerships [Member] | Fair Value, Inputs, Level 1 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 0 | 0 | ||||||
|
Limited Partnerships [Member] | Fair Value, Inputs, Level 2 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 110 | 105 | ||||||
|
Limited Partnerships [Member] | Fair Value, Inputs, Level 3 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 231 | 232 | 230 | 162 | ||||
|
Other Investments [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 694 | [1] | 708 | [1] | ||||
| Swaps Included In Other Investments | 311 | 467 | ||||||
| Participant Loans Included In Other Investments | 76 | 75 | ||||||
| Commodity And Balance Funds Included In Other Investments | 239 | 116 | ||||||
| Other Various Investments | 68 | 50 | ||||||
|
Other Investments [Member] | Fair Value, Inputs, Level 1 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 22 | [1] | 14 | [1] | ||||
|
Other Investments [Member] | Fair Value, Inputs, Level 2 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 543 | [1] | 572 | [1] | ||||
|
Other Investments [Member] | Fair Value, Inputs, Level 3 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 129 | [1] | 122 | [1] | 94 | 188 | ||
|
Money Market And Interest Bearing Cash [Member] | Cash and Cash Equivalents [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 1,404 | 1,065 | ||||||
|
Money Market And Interest Bearing Cash [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 1,404 | 1,065 | ||||||
|
Money Market And Interest Bearing Cash [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 0 | 0 | ||||||
|
Money Market And Interest Bearing Cash [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 0 | 0 | ||||||
|
Mutual Funds [Member] | Cash and Cash Equivalents [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 96 | 30 | ||||||
|
Mutual Funds [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 0 | 0 | ||||||
|
Mutual Funds [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 96 | 30 | ||||||
|
Mutual Funds [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 0 | 0 | ||||||
|
Mutual Funds [Member] | Fixed Income Investments [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 1,531 | 1,569 | ||||||
|
Mutual Funds [Member] | Fixed Income Investments [Member] | Fair Value, Inputs, Level 1 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 99 | 82 | ||||||
|
Mutual Funds [Member] | Fixed Income Investments [Member] | Fair Value, Inputs, Level 2 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 1,432 | 1,487 | ||||||
|
Mutual Funds [Member] | Fixed Income Investments [Member] | Fair Value, Inputs, Level 3 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 0 | 0 | ||||||
|
Mutual Funds [Member] | Equity Securities
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 2,606 | 2,484 | ||||||
|
Mutual Funds [Member] | Equity Securities | Fair Value, Inputs, Level 1 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 290 | 390 | ||||||
|
Mutual Funds [Member] | Equity Securities | Fair Value, Inputs, Level 2 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 2,316 | 2,094 | ||||||
|
Mutual Funds [Member] | Equity Securities | Fair Value, Inputs, Level 3 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 0 | 0 | ||||||
|
Mutual Funds [Member] | Real Estate Investment [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 334 | 260 | ||||||
|
Mutual Funds [Member] | Real Estate Investment [Member] | Fair Value, Inputs, Level 1 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 0 | 0 | ||||||
|
Mutual Funds [Member] | Real Estate Investment [Member] | Fair Value, Inputs, Level 2 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 10 | 11 | ||||||
|
Mutual Funds [Member] | Real Estate Investment [Member] | Fair Value, Inputs, Level 3 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 324 | 249 | 215 | 195 | ||||
|
US Treasury and Government [Member] | Fixed Income Investments [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 4,159 | 4,109 | ||||||
|
US Treasury and Government [Member] | Fixed Income Investments [Member] | Fair Value, Inputs, Level 1 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 1,317 | 1,197 | ||||||
|
US Treasury and Government [Member] | Fixed Income Investments [Member] | Fair Value, Inputs, Level 2 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 2,829 | 2,899 | ||||||
|
US Treasury and Government [Member] | Fixed Income Investments [Member] | Fair Value, Inputs, Level 3 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 13 | 13 | 14 | |||||
|
Corporate Debt Securities [Member] | Fixed Income Investments [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 1,062 | 1,058 | ||||||
|
Corporate Debt Securities [Member] | Fixed Income Investments [Member] | Fair Value, Inputs, Level 1 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 0 | 0 | ||||||
|
Corporate Debt Securities [Member] | Fixed Income Investments [Member] | Fair Value, Inputs, Level 2 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 1,062 | 1,058 | ||||||
|
Corporate Debt Securities [Member] | Fixed Income Investments [Member] | Fair Value, Inputs, Level 3 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 0 | 0 | 14 | 0 | ||||
|
Asset-backed Securities [Member] | Fixed Income Investments [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 1,109 | 907 | ||||||
|
Asset-backed Securities [Member] | Fixed Income Investments [Member] | Fair Value, Inputs, Level 1 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 0 | 0 | ||||||
|
Asset-backed Securities [Member] | Fixed Income Investments [Member] | Fair Value, Inputs, Level 2 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 1,109 | 907 | ||||||
|
Asset-backed Securities [Member] | Fixed Income Investments [Member] | Fair Value, Inputs, Level 3 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 0 | 0 | ||||||
|
Non-U.S. sovereign debt [Member] | Fixed Income Investments [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 615 | 542 | ||||||
|
Non-U.S. sovereign debt [Member] | Fixed Income Investments [Member] | Fair Value, Inputs, Level 1 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 70 | 53 | ||||||
|
Non-U.S. sovereign debt [Member] | Fixed Income Investments [Member] | Fair Value, Inputs, Level 2 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 535 | 479 | ||||||
|
Non-U.S. sovereign debt [Member] | Fixed Income Investments [Member] | Fair Value, Inputs, Level 3 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 10 | 10 | 9 | 6 | ||||
|
Common And Preferred Stocks [Member] | Equity Securities
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 7,432 | 6,862 | ||||||
|
Common And Preferred Stocks [Member] | Equity Securities | Fair Value, Inputs, Level 1 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 7,432 | 6,862 | ||||||
|
Common And Preferred Stocks [Member] | Equity Securities | Fair Value, Inputs, Level 2 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 0 | 0 | ||||||
|
Common And Preferred Stocks [Member] | Equity Securities | Fair Value, Inputs, Level 3 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 0 | 0 | ||||||
|
Public Real Estate Investment Trusts [Member] | Equity Securities
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 236 | 200 | ||||||
|
Public Real Estate Investment Trusts [Member] | Equity Securities | Fair Value, Inputs, Level 1 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 236 | 200 | ||||||
|
Public Real Estate Investment Trusts [Member] | Equity Securities | Fair Value, Inputs, Level 2 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 0 | 0 | ||||||
|
Public Real Estate Investment Trusts [Member] | Equity Securities | Fair Value, Inputs, Level 3 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 0 | 0 | ||||||
|
Private Real Estate [Member] | Real Estate Investment [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 110 | 113 | ||||||
|
Private Real Estate [Member] | Real Estate Investment [Member] | Fair Value, Inputs, Level 1 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 0 | 0 | ||||||
|
Private Real Estate [Member] | Real Estate Investment [Member] | Fair Value, Inputs, Level 2 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | 0 | 0 | ||||||
|
Private Real Estate [Member] | Real Estate Investment [Member] | Fair Value, Inputs, Level 3 [Member]
|
||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, January 1 | $ 110 | $ 113 | $ 110 | $ 119 | ||||
|
||||||||