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Other Comprehensive Income/(Loss) Narrative (Detail) (ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) [Member]
Comprehensive Income (Loss) [Line Items]
Unrealized holding gains on derivative financials instruments	$ 21
Actuarial losses related to benefit plan obligations and plan assets and other benefit plan items	466
Prior service credits related primarily to benefit plan amendments	$ 75

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