Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
OPERATING ACTIVITIES
Net income (loss)	$ 2,625	$ 1,343	$ 1,717
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Provision for credit losses	(418)	1,021	445
Depreciation and amortization expense, net	32	111	241
Accretion of acquired loans	24	28	50
Increase in cash surrender value of corporate-owned life insurance	(113)	(119)	(121)
Stock-based compensation expense	104	101	96
Deferred income taxes (benefit)	146	(191)	53
Proceeds from sales of loans held for sale	16,114	14,076	11,980
Originations of loans held for sale, net of repayments	(16,497)	(13,856)	(11,704)
Net losses (gains) from sale of loans held for sale	(282)	(233)	(188)
Net losses (gains) and writedown on OREO	0	0	7
Net losses (gains) on leased equipment	(12)	(21)	(17)
Net losses (gains) on sales of fixed assets	18	5	(2)
Net securities losses (gains)	(7)	(4)	(20)
Net decrease (increase) in trading account assets	34	305	(191)
Net transfer of loans held for sale	0	0	0
Other operating activities, net	(615)	(893)	560
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	1,153	1,673	2,906
INVESTING ACTIVITIES
Cash received (used) in acquisitions, net of cash acquired	(29)	0	(185)
Net decrease (increase) in short-term investments, excluding acquisitions	5,184	(14,922)	1,290
Purchases of securities available for sale	(28,190)	(15,619)	(5,714)
Proceeds from sales of securities available for sale	1,375	583	362
Proceeds from prepayments and maturities of securities available for sale	7,623	9,923	3,586
Proceeds from prepayments and maturities of held-to-maturity securities	2,889	2,493	1,477
Purchases of held-to-maturity securities	(3)	(17)	(22)
Purchases of other investments	(55)	(134)	(52)
Proceeds from sales of other investments	41	101	60
Proceeds from prepayments and maturities of other investments	26	15	56
Net decrease (increase) in loans, excluding acquisitions, sales, and transfers	(4,276)	(7,358)	(6,190)
Proceeds from sales of portfolio loans	337	211	399
Proceeds from corporate-owned life insurance	72	66	59
Purchases of premises, equipment, and software	(66)	(63)	(85)
Proceeds from sales of premises and equipment	4	0	18
Proceeds from sales of OREO	0	0	23
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	(15,068)	(24,721)	(4,918)
FINANCING ACTIVITIES
Net increase (decrease) in deposits, excluding acquisitions	17,290	23,412	4,561
Net increase (decrease) in short-term borrowings			229
Net increase (decrease) in short-term borrowings	(218)	(113)
Net proceeds from issuance of long-term debt	1,203	3,607	2,129
Payments on long-term debt	(2,566)	(2,508)	(3,634)
Issuance of preferred shares	0	0	435
Open market common share repurchases	(559)	(134)	(835)
Employee equity compensation program Common Share repurchases	(32)	(36)	(33)
Common share purchases under ASR program	(585)	0	0
Net proceeds from reissuance of Common Shares	27	8	18
Cash dividends paid	(823)	(829)	(804)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	13,737	23,407	2,066
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS	(178)	359	54
CASH AND DUE FROM BANKS AT BEGINNING OF YEAR	1,091	732	678
CASH AND DUE FROM BANKS AT END OF YEAR	913	1,091	732
Additional disclosures relative to cash flows:
Interest paid	363	731	1,251
Income taxes paid	277	241	18
Noncash items:
Reduction of secured borrowing and related collateral	9	7	5
Loans transferred to portfolio from held for sale	87	75	157
Loans transferred to held for sale from portfolio	3,403	310	468
Loans transferred to other real estate owned	4	96	29
CMBS risk retentions	28	40	59
ABS risk retentions	11	19	12
Securities received as consideration	$ 2,825	$ 0	$ 0