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Employee Benefit Plans - Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, December 31 | $ 21,729 | $ 20,244 | ||||||
|
Fixed Income Investments [Member] | US Treasury and Government [Member]
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| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, December 31 | 4,159 | 4,109 | ||||||
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Fixed Income Investments [Member] | Corporate Debt Securities [Member]
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||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, December 31 | 1,062 | 1,058 | ||||||
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Fixed Income Investments [Member] | Non-U.S. sovereign debt [Member]
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||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, December 31 | 615 | 542 | ||||||
|
Fixed Income Investments [Member] | Mutual Funds [Member]
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||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, December 31 | 1,531 | 1,569 | ||||||
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Real Estate Investment [Member] | Private Real Estate [Member]
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| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, December 31 | 110 | 113 | ||||||
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Real Estate Investment [Member] | Mutual Funds [Member]
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| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, December 31 | 334 | 260 | ||||||
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Limited Partnerships [Member]
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| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, December 31 | 341 | 337 | ||||||
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Other Investments [Member]
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||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, December 31 | 694 | [1] | 708 | [1] | ||||
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Fair Value, Inputs, Level 3 [Member]
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| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, December 31 | 817 | 739 | 672 | 670 | ||||
| Actual Return on Plan Assets Still Held at the Reporting Date | 25 | 20 | 1 | |||||
| Purchases | 80 | 54 | 50 | |||||
| Sales and Settlements | (28) | (8) | (7) | |||||
| Transfers into/(out of) Level 3 | 1 | 1 | (42) | |||||
|
Fair Value, Inputs, Level 3 [Member] | Fixed Income Investments [Member] | US Treasury and Government [Member]
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||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, December 31 | 13 | 13 | 14 | |||||
| Actual Return on Plan Assets Still Held at the Reporting Date | 0 | (1) | ||||||
| Purchases | 0 | 0 | ||||||
| Sales and Settlements | 0 | 0 | ||||||
| Transfers into/(out of) Level 3 | 0 | 0 | ||||||
|
Fair Value, Inputs, Level 3 [Member] | Fixed Income Investments [Member] | Corporate Debt Securities [Member]
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||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, December 31 | 0 | 0 | 14 | 0 | ||||
| Actual Return on Plan Assets Still Held at the Reporting Date | 0 | |||||||
| Purchases | 0 | |||||||
| Sales and Settlements | 0 | |||||||
| Transfers into/(out of) Level 3 | 14 | |||||||
|
Fair Value, Inputs, Level 3 [Member] | Fixed Income Investments [Member] | Non-U.S. sovereign debt [Member]
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||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, December 31 | 10 | 10 | 9 | 6 | ||||
| Actual Return on Plan Assets Still Held at the Reporting Date | (1) | 0 | 1 | |||||
| Purchases | 1 | 3 | 0 | |||||
| Sales and Settlements | (1) | (2) | 0 | |||||
| Transfers into/(out of) Level 3 | 1 | 0 | 2 | |||||
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Fair Value, Inputs, Level 3 [Member] | Fixed Income Investments [Member] | Mutual Funds [Member]
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||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, December 31 | 0 | 0 | ||||||
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Fair Value, Inputs, Level 3 [Member] | Real Estate Investment [Member] | Private Real Estate [Member]
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||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, December 31 | 110 | 113 | 110 | 119 | ||||
| Actual Return on Plan Assets Still Held at the Reporting Date | (2) | 0 | (9) | |||||
| Purchases | 2 | 3 | 1 | |||||
| Sales and Settlements | (3) | 0 | (1) | |||||
| Transfers into/(out of) Level 3 | 0 | 0 | 0 | |||||
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Fair Value, Inputs, Level 3 [Member] | Real Estate Investment [Member] | Mutual Funds [Member]
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||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, December 31 | 324 | 249 | 215 | 195 | ||||
| Actual Return on Plan Assets Still Held at the Reporting Date | 13 | 26 | (4) | |||||
| Purchases | 62 | 9 | 24 | |||||
| Sales and Settlements | 0 | (1) | 0 | |||||
| Transfers into/(out of) Level 3 | 0 | 0 | 0 | |||||
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Fair Value, Inputs, Level 3 [Member] | Limited Partnerships [Member]
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||||||||
| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, December 31 | 231 | 232 | 230 | 162 | ||||
| Actual Return on Plan Assets Still Held at the Reporting Date | 8 | (6) | 13 | |||||
| Purchases | 11 | 13 | 7 | |||||
| Sales and Settlements | (20) | (5) | (5) | |||||
| Transfers into/(out of) Level 3 | 0 | 0 | 53 | |||||
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Fair Value, Inputs, Level 3 [Member] | Other Investments [Member]
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| Defined Benefit Plan Disclosure [Line Items] | ||||||||
| Fair Value, December 31 | 129 | [1] | 122 | [1] | 94 | 188 | ||
| Actual Return on Plan Assets Still Held at the Reporting Date | 7 | 1 | 0 | |||||
| Purchases | 4 | 26 | 18 | |||||
| Sales and Settlements | (4) | 0 | (1) | |||||
| Transfers into/(out of) Level 3 | $ 0 | $ 1 | $ (111) | |||||
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