Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
OPERATING ACTIVITIES
Net income (loss)	$ 1,996	$ 761
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Provision for credit losses	(422)	1,001
Depreciation and amortization expense, net	80	112
Accretion of acquired loans	19	23
Increase in cash surrender value of corporate-owned life insurance	(82)	(86)
Stock-based compensation expense	78	75
Deferred income taxes (benefit)	126	(217)
Proceeds from sales of loans held for sale	11,282	10,079
Originations of loans held for sale, net of repayments	(10,818)	(10,040)
Net losses (gains) on sales of loans held for sale	(192)	(169)
Net losses (gains) on leased equipment	(9)	(17)
Net securities losses (gains)	0	(4)
Net losses (gains) on sales of fixed assets	13	3
Net decrease (increase) in trading account assets	(167)	307
Net transfers of loans held for sale	26	0
Other operating activities, net	(767)	(1,101)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	1,163	727
INVESTING ACTIVITIES
Cash received (used) in acquisitions, net of cash acquired	(9)	0
Net decrease (increase) in short-term investments, excluding acquisitions	(3,414)	(12,876)
Purchases of securities available for sale	(19,726)	(9,582)
Proceeds from sales of securities available for sale	0	583
Proceeds from prepayments and maturities of securities available for sale	5,824	4,642
Proceeds from prepayments and maturities of held-to-maturity securities	2,004	1,702
Purchases of held-to-maturity securities	(3)	(17)
Purchases of other investments	(26)	(110)
Proceeds from sales of other investments	36	79
Proceeds from prepayments and maturities of other investments	8	13
Net decrease (increase) in loans, excluding acquisitions, sales and transfers	(545)	(9,118)
Proceeds from sales of portfolio loans	(243)
Proceeds from sales of portfolio loans		140
Proceeds from corporate-owned life insurance	56	46
Purchases of premises, equipment, and software	(31)	(45)
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	(16,069)	(24,543)
FINANCING ACTIVITIES
Net increase (decrease) in deposits, excluding acquisitions	16,649	24,876
Net increase (decrease) in short-term borrowings	16	(61)
Net proceeds from issuance of long-term debt	1,203	2,502
Payments on long-term debt	(1,521)	(2,509)
Open market common share repurchases	(559)	(117)
Employee equity compensation program Common Share repurchases	(32)	(36)
Common share purchases under ASR program	(585)	0
Net proceeds from reissuance of Common Shares	21	7
Cash dividends paid	(614)	(622)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	14,578	24,040
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS	(328)	224
CASH AND DUE FROM BANKS AT BEGINNING OF PERIOD	1,091	732
CASH AND DUE FROM BANKS AT END OF PERIOD	763	956
Additional disclosures relative to cash flows:
Interest paid	254	601
Income taxes paid (refunded)	212	175
Noncash items:
Reduction of secured borrowing and related collateral	7	5
Loans transferred to portfolio from held for sale	86	32
Loans transferred to held for sale from portfolio	3,403	292
Loans transferred to OREO	3	94
CMBS risk retentions	0	41
ABS risk retentions	13	22
Securities received as consideration	$ 2,825	$ 0