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Summary of Non-cash Operating, Investing and Financing Activities (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of Non-cash Operating, Investing and Financing Activities [Abstract]
Tax benefit of stock compensation plan transactions	$ 6	$ 10	$ 12
Change in fair value of derivatives accounted for as cash flow hedges, net of tax	(76)	14	10
Actuarial gain (loss), net, related to defined benefit pension and postretirement benefit plans	$ (35)	$ 13	$ (34)

Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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