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Pension and Other Benefit Plans - Defined Benefit Plan, Amounts That Will be Amortized from Accumulated Other Comprehensive Income (loss) in Next Fiscal Year (Detail) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
US Plan Assets [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Net actuarial losses	$ 249
Prior service cost (credit)	133
Postretirement Medical Plan [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Net actuarial losses	27
Prior service cost (credit)	$ (4)

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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- Definition

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.

+ References+ Details