Consolidated Statements of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Activities
Net income		$ 538	$ 218	$ 187
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization		76	70	56
Provision (benefit) for credit losses		149	18	(8)
Net gain on loan and asset sales		(971)	(335)	(200)
Proceeds from sales of HFS		41,799	15,866	8,935
Origination, premium paid and purchase of loans, net of principal repayments		(48,857)	(32,715)	(32,261)
Net change in:
Other		(763)	(205)	(87)
Net cash used in operating activities		(8,029)	(17,083)	(23,378)
Investing Activities
Proceeds from sale of AFS securities including loans that have been securitized		6,756	15,873	23,721
Collection of principal on investment securities AFS		610	184	199
Purchase of investment securities AFS and other		(360)	(500)	(340)
Collection of principal on investment securities HTM		221	106	92
Proceeds received from the sale of LHFI		488	219	161
Net origination, purchase, and principal repayments of LHFI		(4,650)	(3,179)	(978)
Acquisition of premises and equipment, net of proceeds		(54)	(61)	(71)
Net purchase of FHLB stock		74	0	0
Proceeds from the sale of MSRs		65	62	334
Assets acquired in business combinations		0	0	1,499
Other, net		(16)	(16)	(10)
Net cash provided by investing activities		2,986	12,688	24,607
Financing Activities
Net change in deposit accounts		4,826	2,766	1,072
Net change in short-term FHLB borrowings and other short-term debt		(265)	923	(1,016)
Proceeds from increases in FHLB long-term advances and other debt		550	550	200
Repayment of long-term FHLB advances		0	(50)	(1,455)
Repayment of long-term debt		(3)	0	0
Proceeds from issuance of subordinated debt		150	0	0
Subordinated debt issuance costs		(2)	0	0
Net receipt of payments of loans serviced for others		165	284	181
Dividends declared and paid		(11)	(9)	0
Stock repurchase		(150)	(50)	0
Other		(19)	5	(2)
Net cash provided by (used in) by financing activities		5,241	4,419	(1,020)
Net increase (decrease) in cash, cash equivalents and restricted cash	[1]	198	24	209
Beginning cash, cash equivalents and restricted cash	[1]	456	432	223
Ending cash, cash equivalents and restricted cash	[1]	654	456	432
Supplemental disclosure of cash flow information
Interest paid on deposits and other borrowings		133	230	185
Income tax payments		161	4	0
Non-cash reclassification of investment securities HTM to AFS		0	0	144
Non-cash reclassification of loans originated LHFI to LHFS		549	120	279
Non-cash reclassification of LHFS to AFS securities		6,761	15,458	23,718
MSRs resulting from sale or securitization of loans		$ 268	$ 223	$ 356

[1] For further information on restricted cash, see Note 11 - Derivatives.