CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Cash flows from operating activities
Net income (loss)	$ (179)	$ 129		$ 330
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	(112)	(45)		158
Provision for credit losses	(165)	372	[1]	361
Deferred income tax provision	303	(140)		190
Net realized gains on securities available-for-sale	(52)	(70)		(48)
Net change in other assets and liabilities	(454)	1,726		386
Net change in loans held for sale:
Originations and purchases of loans held for sale	(2,360)	(2,398)		(2,145)
Sales and collections of loans held for sale	2,522	2,581		2,371
Net change in trading assets and liabilities	671	(2,312)		3,298
Lower of amortized cost or fair value adjustments on loans held for sale	(18)	83		14
Gain (loss) on instruments designated at fair value and related derivatives	(43)	71		(264)
Net cash provided by (used in) operating activities	113	(3)		4,651
Cash flows from investing activities
Net change in interest bearing deposits with banks	9,081	(12,760)		23,329
Net change in federal funds sold and securities purchased under agreements to resell	(2,596)	(10,176)		(18,434)
Securities available-for-sale:
Purchases of securities available-for-sale	(9,229)	(22,815)		(23,375)
Proceeds from sales of securities available-for-sale	14,196	19,462		15,149
Proceeds from maturities of securities available-for-sale	1,800	1,930		1,954
Securities held-to-maturity:
Purchases of securities held-to-maturity	(3,722)	(1,538)		(2,993)
Proceeds from maturities of securities held-to-maturity	2,512	2,704		2,408
Change in loans:
Collections, net of originations	(19)	7,391		(7,145)
Loans sold to third parties	2,183	1,621		13
Net cash used for acquisitions of properties and equipment	(36)	(32)		(43)
Outflows related to the sale of a portion of our Private Banking business	(320)	0		0
Other, net	546	111		(386)
Net cash provided by (used in) investing activities	14,396	(14,102)		(9,523)
Cash flows from financing activities
Net change in deposits	(10,290)	10,525		2,472
Debt:
Net change in short-term borrowings	(449)	110		(7,806)
Issuance of long-term debt	5,158	8,694		16,586
Repayment of long-term debt	(8,953)	(4,869)		(9,937)
Preferred stock issuance	0	1,265		0
Preferred stock redemption	0	(1,265)		(300)
Capital contribution from parent	0	0		4,000
Other increases (decreases) in capital surplus	(18)	(21)		(1)
Dividends paid	(77)	(67)		(65)
Net cash provided by (used in) financing activities	(14,629)	14,372		4,949
Net change in cash and due from banks	(120)	267		77
Cash and due from banks at beginning of period	1,235	968		891
Cash and due from banks at end of period	1,115	1,235		968
Supplemental Cash Flow Information [Abstract]
Interest paid during the period	1,811	1,446		942
Net income taxes paid (refunded) during the period	783	(289)		354
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Transfer of loans to held for sale, net	1,253	1,588		1,850
Transfer of other assets to loans held for sale	0	78		0
Fair value of properties added to real estate owned upon foreclosure	$ 12	$ 41		$ 40

[1] The provision for credit losses and charge-offs for residential mortgage loans during 2016 includes $11 million related to the lower of amortized cost or fair value adjustment attributable to credit factors for loans transferred to held for sale. See Note 7, "Loans Held for Sale," for additional information.