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Derivatives and Hedging Activities Derivatives and Hedging Activities (Net unrealized derivatives gains/losses included in AOCI) (Details 7) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Net unrealized derivatives gains (losses) at January 1	$ (1)	$ (2)	$ (11)
Holding gains (losses)			14
Reclassification of realized (gains) losses	1	1	(1)
Income tax benefit (provision)	0	0	(4)
Net unrealized derivatives gains (losses) at December 31	$ 0	$ (1)	$ (2)

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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