CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 523us-gaap_NetIncomeLoss	$ 536us-gaap_NetIncomeLoss	$ (845)us-gaap_NetIncomeLoss
Net change in unrealized gains (losses), net of tax, on:
Derivatives designated as cash flow hedges	45	261	136
Securities available-for-sale, not other-than temporarily impaired	0	(115)	12
Other-than-temporarily impaired debt securities available-for-sale	0	(1)	2
Pension and postretirement benefit plan adjustments	(2)	15	(15)
Foreign currency translation adjustments	0	(11)	4
Other comprehensive income, net of tax	43	149	139
Total comprehensive income (loss)	$ 566us-gaap_ComprehensiveIncomeNetOfTax	$ 685us-gaap_ComprehensiveIncomeNetOfTax	$ (706)us-gaap_ComprehensiveIncomeNetOfTax

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax and reclassification adjustments, 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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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax of other than temporary impairment (OTTI) loss on investment in available-for-sale debt security, recognized in other comprehensive loss.

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