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Pension and Postretirement Benefit Plans - Amounts Expected to be Amortized into Net Periodic Benefit Costs (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended |
|---|---|
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Dec. 31, 2011
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U.S. Qualified Pension Plans [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |
| Actuarial losses | $ (320) |
| Prior service credits and other | 15 |
| Total | (305) |
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U.S. Supplemental (Non-Qualified) Pension Plans [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |
| Actuarial losses | (44) |
| Prior service credits and other | 3 |
| Total | (41) |
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International Pension Plans [Member]
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|
| Defined Benefit Plan Disclosure [Line Items] | |
| Actuarial losses | (69) |
| Prior service credits and other | 7 |
| Total | (62) |
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Postretirement Plans [Member]
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|
| Defined Benefit Plan Disclosure [Line Items] | |
| Actuarial losses | (33) |
| Prior service credits and other | 50 |
| Total | $ 17 |