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
Dec. 31, 2011
U.S. Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses	$ (320)
Prior service credits and other	15
Total	(305)
U.S. Supplemental (Non-Qualified) Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses	(44)
Prior service credits and other	3
Total	(41)
International Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses	(69)
Prior service credits and other	7
Total	(62)
Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses	(33)
Prior service credits and other	50
Total	$ 17

The amounts in accumulated other comprehensive income related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

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The amounts in accumulated other comprehensive income related to prior service cost or credit expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

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- Definition

The aggregate amount in accumulated other comprehensive income expected to be recognized as a component of net periodic benefit cost over the fiscal year that follows the most recent annual statement of financial position presented, including the net gain (loss), net prior service cost or credit, and net transition asset or obligation.

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