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Employee Benefit Plans - Amounts Included in Accumulated Other Comprehensive Income That are Expected to Be Amortized into Net Periodic Postretirement Cost (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended |
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Dec. 31, 2011
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U.S. (Pension Benefits) [Member]
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| Pension Plans, Postretirement and Other Employee Benefits [Line Items] | |
| Unrecognized net actuarial loss (gain) | $ 235 |
| Unrecognized prior service cost | 9 |
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Int'l (Pension Benefits) [Member]
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| Pension Plans, Postretirement and Other Employee Benefits [Line Items] | |
| Unrecognized net actuarial loss (gain) | 71 |
| Unrecognized prior service cost | (9) |
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Other Benefits [Member]
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| Pension Plans, Postretirement and Other Employee Benefits [Line Items] | |
| Unrecognized net actuarial loss (gain) | (3) |
| Unrecognized prior service cost | $ (4) |