Employee Benefit Plans - Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | |||||||
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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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Dec. 31, 2008
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Defined Benefit Plan Disclosure [Line Items] | ||||||||
Fair Value, December 31 | $ 20,244 | $ 20,136 | ||||||
Fixed Income Investments [Member] | US Treasury and Government [Member]
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Defined Benefit Plan Disclosure [Line Items] | ||||||||
Fair Value, December 31 | 4,109 | 3,319 | ||||||
Fixed Income Investments [Member] | Corporate Debt Securities [Member]
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Defined Benefit Plan Disclosure [Line Items] | ||||||||
Fair Value, December 31 | 1,058 | 1,106 | ||||||
Fixed Income Investments [Member] | Non-U.S. sovereign debt [Member]
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Defined Benefit Plan Disclosure [Line Items] | ||||||||
Fair Value, December 31 | 542 | 465 | ||||||
Fixed Income Investments [Member] | Mutual Funds [Member]
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Defined Benefit Plan Disclosure [Line Items] | ||||||||
Fair Value, December 31 | 1,569 | 1,743 | ||||||
Real Estate Investment [Member] | Private Real Estate [Member]
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Defined Benefit Plan Disclosure [Line Items] | ||||||||
Fair Value, December 31 | 113 | 110 | ||||||
Real Estate Investment [Member] | Mutual Funds [Member]
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Defined Benefit Plan Disclosure [Line Items] | ||||||||
Fair Value, December 31 | 260 | 247 | ||||||
Limited Partnerships [Member]
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Defined Benefit Plan Disclosure [Line Items] | ||||||||
Fair Value, December 31 | 337 | 331 | ||||||
Other Investments [Member]
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Defined Benefit Plan Disclosure [Line Items] | ||||||||
Fair Value, December 31 | 708 | [1] | 343 | [1] | ||||
Fair Value, Inputs, Level 3 [Member]
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Defined Benefit Plan Disclosure [Line Items] | ||||||||
Fair Value, December 31 | 739 | 672 | 670 | 821 | ||||
Actual Return on Plan Assets Still Held at the Reporting Date | 20 | 1 | (214) | |||||
Purchases | 54 | 50 | 52 | |||||
Sales and Settlements | (8) | (7) | (9) | |||||
Transfers into/(out of) Level 3 | 1 | (42) | 20 | |||||
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 | 14 | 0 | |||||
Actual Return on Plan Assets Still Held at the Reporting Date | (1) | 0 | ||||||
Purchases | 0 | 0 | ||||||
Sales and Settlements | 0 | 0 | ||||||
Transfers into/(out of) Level 3 | 0 | 14 | ||||||
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 | 0 | 1 | ||||
Actual Return on Plan Assets Still Held at the Reporting Date | (1) | |||||||
Purchases | 0 | |||||||
Sales and Settlements | 0 | |||||||
Transfers into/(out of) Level 3 | 0 | |||||||
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 | 9 | 6 | 6 | ||||
Actual Return on Plan Assets Still Held at the Reporting Date | 0 | 1 | 0 | |||||
Purchases | 3 | 0 | 0 | |||||
Sales and Settlements | (2) | 0 | 0 | |||||
Transfers into/(out of) Level 3 | 0 | 2 | 0 | |||||
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 | ||||||
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 | 113 | 110 | 119 | 149 | ||||
Actual Return on Plan Assets Still Held at the Reporting Date | 0 | (9) | (29) | |||||
Purchases | 3 | 1 | 0 | |||||
Sales and Settlements | 0 | (1) | (1) | |||||
Transfers into/(out of) Level 3 | 0 | 0 | 0 | |||||
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 | 249 | 215 | 195 | 281 | ||||
Actual Return on Plan Assets Still Held at the Reporting Date | 26 | (4) | (92) | |||||
Purchases | 9 | 24 | 6 | |||||
Sales and Settlements | (1) | 0 | 0 | |||||
Transfers into/(out of) Level 3 | 0 | 0 | 0 | |||||
Fair Value, Inputs, Level 3 [Member] | Limited Partnerships [Member]
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Defined Benefit Plan Disclosure [Line Items] | ||||||||
Fair Value, December 31 | 232 | 230 | 162 | 91 | ||||
Actual Return on Plan Assets Still Held at the Reporting Date | (6) | 13 | 14 | |||||
Purchases | 13 | 7 | 41 | |||||
Sales and Settlements | (5) | (5) | (4) | |||||
Transfers into/(out of) Level 3 | 0 | 53 | 20 | |||||
Fair Value, Inputs, Level 3 [Member] | Other Investments [Member]
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Defined Benefit Plan Disclosure [Line Items] | ||||||||
Fair Value, December 31 | 122 | [1] | 94 | [1] | 188 | 293 | ||
Actual Return on Plan Assets Still Held at the Reporting Date | 1 | 0 | (106) | |||||
Purchases | 26 | 18 | 5 | |||||
Sales and Settlements | 0 | (1) | (4) | |||||
Transfers into/(out of) Level 3 | $ 1 | $ (111) | $ 0 | |||||
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