Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Fair Value Measurements (Details)

v2.4.0.8
Employee Benefit Plans - Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Change in fair value of plan assets      
Fair value, December 31 $ 23,525 $ 21,729  
Cash and Cash Equivalents [Member] | Money Market And Interest Bearing Cash [Member]
      
Change in fair value of plan assets      
Fair value, December 31 2,586 1,404  
Cash and Cash Equivalents [Member] | Mutual Funds [Member]
      
Change in fair value of plan assets      
Fair value, December 31 223 96  
Fixed Income Investments [Member] | US Treasury and Government [Member]
      
Change in fair value of plan assets      
Fair value, December 31 3,847 4,159  
Fixed Income Investments [Member] | Non-U.S. sovereign debt [Member]
      
Change in fair value of plan assets      
Fair value, December 31 1,055 615  
Fixed Income Investments [Member] | Mutual Funds [Member]
      
Change in fair value of plan assets      
Fair value, December 31 1,368 1,531  
Fixed Income Investments [Member] | Corporate Debt Securities [Member]
      
Change in fair value of plan assets      
Fair value, December 31 1,233 1,062  
Fixed Income Investments [Member] | Asset-backed Securities [Member]
      
Change in fair value of plan assets      
Fair value, December 31 1,455 1,109  
Equity Securities [Member] | Mutual Funds [Member]
      
Change in fair value of plan assets      
Fair value, December 31 2,521 2,606  
Equity Securities [Member] | Public Real Estate Investment Trusts [Member]
      
Change in fair value of plan assets      
Fair value, December 31 127 236  
Equity Securities [Member] | Common And Preferred Stocks [Member]
      
Change in fair value of plan assets      
Fair value, December 31 7,463 7,432  
Real Estate Investment [Member] | Private Real Estate [Member]
      
Change in fair value of plan assets      
Fair value, December 31 119 110  
Real Estate Investment [Member] | Mutual Funds [Member]
      
Change in fair value of plan assets      
Fair value, December 31 469 334  
Limited Partnerships [Member]
      
Change in fair value of plan assets      
Fair value, December 31 262 341  
Other Investments [Member]
      
Table Details [Abstract]      
Swaps Included In Other Investments 435 311  
Participant Loans Included In Other Investments 87 76  
Commodity And Balance Funds Included In Other Investments 229 239  
Other Various Investments 46 68  
Change in fair value of plan assets      
Fair value, December 31 797 [1] 694 [1]  
Level 1 [Member]
      
Change in fair value of plan assets      
Fair value, December 31 12,615 10,870  
Level 1 [Member] | Cash and Cash Equivalents [Member] | Money Market And Interest Bearing Cash [Member]
      
Change in fair value of plan assets      
Fair value, December 31 2,586 1,404  
Level 1 [Member] | Cash and Cash Equivalents [Member] | Mutual Funds [Member]
      
Change in fair value of plan assets      
Fair value, December 31 0 0  
Level 1 [Member] | Fixed Income Investments [Member] | US Treasury and Government [Member]
      
Change in fair value of plan assets      
Fair value, December 31 1,590 1,317  
Level 1 [Member] | Fixed Income Investments [Member] | Non-U.S. sovereign debt [Member]
      
Change in fair value of plan assets      
Fair value, December 31 547 70  
Level 1 [Member] | Fixed Income Investments [Member] | Mutual Funds [Member]
      
Change in fair value of plan assets      
Fair value, December 31 89 99  
Level 1 [Member] | Fixed Income Investments [Member] | Corporate Debt Securities [Member]
      
Change in fair value of plan assets      
Fair value, December 31 0 0  
Level 1 [Member] | Fixed Income Investments [Member] | Asset-backed Securities [Member]
      
Change in fair value of plan assets      
Fair value, December 31 0 0  
Level 1 [Member] | Equity Securities [Member] | Mutual Funds [Member]
      
Change in fair value of plan assets      
Fair value, December 31 213 290  
Level 1 [Member] | Equity Securities [Member] | Public Real Estate Investment Trusts [Member]
      
Change in fair value of plan assets      
Fair value, December 31 127 236  
Level 1 [Member] | Equity Securities [Member] | Common And Preferred Stocks [Member]
      
Change in fair value of plan assets      
Fair value, December 31 7,463 7,432  
Level 1 [Member] | Real Estate Investment [Member] | Private Real Estate [Member]
      
Change in fair value of plan assets      
Fair value, December 31 0 0  
Level 1 [Member] | Real Estate Investment [Member] | Mutual Funds [Member]
      
Change in fair value of plan assets      
Fair value, December 31 0 0  
Level 1 [Member] | Limited Partnerships [Member]
      
Change in fair value of plan assets      
Fair value, December 31 0 0  
Level 1 [Member] | Other Investments [Member]
      
Change in fair value of plan assets      
Fair value, December 31 0 [1] 22 [1]  
Level 2 [Member]
      
Change in fair value of plan assets      
Fair value, December 31 10,031 10,042  
Level 2 [Member] | Cash and Cash Equivalents [Member] | Money Market And Interest Bearing Cash [Member]
      
Change in fair value of plan assets      
Fair value, December 31 0 0  
Level 2 [Member] | Cash and Cash Equivalents [Member] | Mutual Funds [Member]
      
Change in fair value of plan assets      
Fair value, December 31 223 96  
Level 2 [Member] | Fixed Income Investments [Member] | US Treasury and Government [Member]
      
Change in fair value of plan assets      
Fair value, December 31 2,245 2,829  
Level 2 [Member] | Fixed Income Investments [Member] | Non-U.S. sovereign debt [Member]
      
Change in fair value of plan assets      
Fair value, December 31 502 535  
Level 2 [Member] | Fixed Income Investments [Member] | Mutual Funds [Member]
      
Change in fair value of plan assets      
Fair value, December 31 1,279 1,432  
Level 2 [Member] | Fixed Income Investments [Member] | Corporate Debt Securities [Member]
      
Change in fair value of plan assets      
Fair value, December 31 1,233 1,062  
Level 2 [Member] | Fixed Income Investments [Member] | Asset-backed Securities [Member]
      
Change in fair value of plan assets      
Fair value, December 31 1,455 1,109  
Level 2 [Member] | Equity Securities [Member] | Mutual Funds [Member]
      
Change in fair value of plan assets      
Fair value, December 31 2,308 2,316  
Level 2 [Member] | Equity Securities [Member] | Public Real Estate Investment Trusts [Member]
      
Change in fair value of plan assets      
Fair value, December 31 0 0  
Level 2 [Member] | Equity Securities [Member] | Common And Preferred Stocks [Member]
      
Change in fair value of plan assets      
Fair value, December 31 0 0  
Level 2 [Member] | Real Estate Investment [Member] | Private Real Estate [Member]
      
Change in fair value of plan assets      
Fair value, December 31 0 0  
Level 2 [Member] | Real Estate Investment [Member] | Mutual Funds [Member]
      
Change in fair value of plan assets      
Fair value, December 31 7 10  
Level 2 [Member] | Limited Partnerships [Member]
      
Change in fair value of plan assets      
Fair value, December 31 117 110  
Level 2 [Member] | Other Investments [Member]
      
Change in fair value of plan assets      
Fair value, December 31 662 [1] 543 [1]  
Level 3 [Member]
      
Change in fair value of plan assets      
Fair value, January 1 817 739 672
Actual Return on Plan Assets Still Held at the Reporting Date 19 25 20
Purchases 166 80 54
Sales and Settlements (95) (28) (8)
Transfers into/(out of) Level 3 (28) 1 1
Fair value, December 31 879 817 739
Level 3 [Member] | Cash and Cash Equivalents [Member] | Money Market And Interest Bearing Cash [Member]
      
Change in fair value of plan assets      
Fair value, December 31 0 0  
Level 3 [Member] | Cash and Cash Equivalents [Member] | Mutual Funds [Member]
      
Change in fair value of plan assets      
Fair value, December 31 0 0  
Level 3 [Member] | Fixed Income Investments [Member] | US Treasury and Government [Member]
      
Change in fair value of plan assets      
Fair value, January 1 13 13 14
Actual Return on Plan Assets Still Held at the Reporting Date 0 0 (1)
Purchases 0 0 0
Sales and Settlements (1) 0 0
Transfers into/(out of) Level 3 0 0 0
Fair value, December 31 12 13 13
Level 3 [Member] | Fixed Income Investments [Member] | Non-U.S. sovereign debt [Member]
      
Change in fair value of plan assets      
Fair value, January 1 10 10 9
Actual Return on Plan Assets Still Held at the Reporting Date (2) (1) 0
Purchases 0 1 3
Sales and Settlements (2) (1) (2)
Transfers into/(out of) Level 3 0 1 0
Fair value, December 31 6 10 10
Level 3 [Member] | Fixed Income Investments [Member] | Mutual Funds [Member]
      
Change in fair value of plan assets      
Fair value, December 31 0 0  
Level 3 [Member] | Fixed Income Investments [Member] | Corporate Debt Securities [Member]
      
Change in fair value of plan assets      
Fair value, December 31 0 0  
Level 3 [Member] | Fixed Income Investments [Member] | Asset-backed Securities [Member]
      
Change in fair value of plan assets      
Fair value, December 31 0 0  
Level 3 [Member] | Equity Securities [Member] | Mutual Funds [Member]
      
Change in fair value of plan assets      
Fair value, December 31 0 0  
Level 3 [Member] | Equity Securities [Member] | Public Real Estate Investment Trusts [Member]
      
Change in fair value of plan assets      
Fair value, December 31 0 0  
Level 3 [Member] | Equity Securities [Member] | Common And Preferred Stocks [Member]
      
Change in fair value of plan assets      
Fair value, December 31 0 0  
Level 3 [Member] | Real Estate Investment [Member] | Private Real Estate [Member]
      
Change in fair value of plan assets      
Fair value, January 1 110 113 110
Actual Return on Plan Assets Still Held at the Reporting Date 4 (2) 0
Purchases 7 2 3
Sales and Settlements (2) (3) 0
Transfers into/(out of) Level 3 0 0 0
Fair value, December 31 119 110 113
Level 3 [Member] | Real Estate Investment [Member] | Mutual Funds [Member]
      
Change in fair value of plan assets      
Fair value, January 1 324 249 215
Actual Return on Plan Assets Still Held at the Reporting Date 15 13 26
Purchases 123 62 9
Sales and Settlements 0 0 (1)
Transfers into/(out of) Level 3 0 0 0
Fair value, December 31 462 324 249
Level 3 [Member] | Limited Partnerships [Member]
      
Change in fair value of plan assets      
Fair value, January 1 231 232 230
Actual Return on Plan Assets Still Held at the Reporting Date 8 8 (6)
Purchases 23 11 13
Sales and Settlements (89) (20) (5)
Transfers into/(out of) Level 3 (28) 0 0
Fair value, December 31 145 231 232
Level 3 [Member] | Other Investments [Member]
      
Change in fair value of plan assets      
Fair value, January 1 129 [1] 122 94
Actual Return on Plan Assets Still Held at the Reporting Date (6) 7 1
Purchases 13 4 26
Sales and Settlements (1) (4) 0
Transfers into/(out of) Level 3 0 0 1
Fair value, December 31 $ 135 [1] $ 129 [1] $ 122
[1] Other investments include interest rate swaps of $435 million and $311 million, participant loans of $87 million and $76 million, commodity and balanced funds of $229 million and $239 million and other various investments of $46 million and $68 million at December 31, 2013 and 2012.