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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 70us-gaap_NetIncomeLoss	$ 1us-gaap_NetIncomeLoss	$ 179us-gaap_NetIncomeLoss	$ 104us-gaap_NetIncomeLoss	$ (705)us-gaap_NetIncomeLoss	$ 4us-gaap_NetIncomeLoss	$ 180us-gaap_NetIncomeLoss	$ 183us-gaap_NetIncomeLoss	$ 354us-gaap_NetIncomeLoss	$ (338)us-gaap_NetIncomeLoss	$ (1,045)us-gaap_NetIncomeLoss
Net change in unrealized gains (losses), net of tax:
Investment securities									176	(1,010)	109
Other-than-temporarily impaired debt securities held-to-maturity									60	7	0
Derivatives designated as cash flow hedges									(73)	118	28
Pension and post-retirement benefit plans									(5)	8	6
Total other comprehensive income (loss)									158	(877)	143
Comprehensive income (loss)									$ 512us-gaap_ComprehensiveIncomeNetOfTax	$ (1,215)us-gaap_ComprehensiveIncomeNetOfTax	$ (902)us-gaap_ComprehensiveIncomeNetOfTax