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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Statement of Comprehensive Income [Abstract]
Reclassification of previously deferred derivative losses to (gains) losses on derivatives, net, tax effect	$ (1)	$ (1)
Amortization of net actuarial (gain) loss to general and administrative expense, tax effect	$ (10)	$ (8)

Tax effect of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income. Also includes reclassification adjustments of an entity's share of an equity investee's deferred hedging gain (loss) realized in net income.

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