Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
OPERATING ACTIVITIES
Net income (loss)	$ 761,000,000	$ 1,248,000,000
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Provision for credit losses	1,001,000,000	336,000,000
Depreciation and amortization expense, net	112,000,000	183,000,000
Accretion of acquired loans	23,000,000	39,000,000
Increase in cash surrender value of corporate-owned life insurance	(86,000,000)	(86,000,000)
Stock-based compensation expense	75,000,000	72,000,000
Deferred income taxes (benefit)	(217,000,000)	81,000,000
Proceeds from sales of loans held for sale	10,079,000,000	8,103,000,000
Originations of loans held for sale, net of repayments	(10,040,000,000)	(8,063,000,000)
Net losses (gains) on sales of loans held for sale	(169,000,000)	(126,000,000)
Net losses (gains) on leased equipment	(17,000,000)	(16,000,000)
Net securities losses (gains)	(4,000,000)	(15,000,000)
Net losses (gains) on sales of fixed assets	3,000,000	(1,000,000)
Net decrease (increase) in trading account assets	307,000,000	(114,000,000)
Other operating activities, net	(1,101,000,000)	272,000,000
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	727,000,000	1,913,000,000
INVESTING ACTIVITIES
Cash received (used) in acquisitions, net of cash acquired	0	(185,000,000)
Net decrease (increase) in short-term investments, excluding acquisitions	(12,876,000,000)	(789,000,000)
Purchases of securities available for sale	(9,582,000,000)	(4,618,000,000)
Proceeds from sales of securities available for sale	583,000,000	24,000,000
Proceeds from prepayments and maturities of securities available for sale	4,642,000,000	2,395,000,000
Proceeds from prepayments and maturities of held-to-maturity securities	1,702,000,000	1,054,000,000
Purchases of held-to-maturity securities	(17,000,000)	(22,000,000)
Purchases of other investments	(110,000,000)	(33,000,000)
Proceeds from sales of other investments	79,000,000	40,000,000
Proceeds from prepayments and maturities of other investments	13,000,000	39,000,000
Net decrease (increase) in loans, excluding acquisitions, sales and transfers	(9,118,000,000)	(4,122,000,000)
Proceeds from sales of portfolio loans	140,000,000	245,000,000
Proceeds from corporate-owned life insurance	46,000,000	41,000,000
Purchases of premises, equipment, and software	(45,000,000)	(58,000,000)
Proceeds from sales of premises and equipment	0	17,000,000
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	(24,543,000,000)	(5,972,000,000)
FINANCING ACTIVITIES
Net increase (decrease) in deposits, excluding acquisitions	24,876,000,000	4,340,000,000
Net increase (decrease) in short-term borrowings	(61,000,000)
Net increase (decrease) in short-term borrowings		19,000,000
Net proceeds from issuance of long-term debt	2,502,000,000	2,113,000,000
Payments on long-term debt	(2,509,000,000)	(1,675,000,000)
Issuance of preferred shares	0	435,000,000
Open market Common Share repurchases	(117,000,000)	(594,000,000)
Employee equity compensation program Common Share repurchases	(36,000,000)	(33,000,000)
Net proceeds from reissuance of Common Shares	7,000,000	7,000,000
Cash dividends paid	(622,000,000)	(595,000,000)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	24,040,000,000	4,017,000,000
NET INCREASE (DECREASE) IN CASH AND DUE FROM BANKS	224,000,000	(42,000,000)
CASH AND DUE FROM BANKS AT BEGINNING OF PERIOD	732,000,000	678,000,000
CASH AND DUE FROM BANKS AT END OF PERIOD	956,000,000	636,000,000
Additional disclosures relative to cash flows:
Interest paid	601,000,000	950,000,000
Income taxes paid (refunded)	175,000,000	(22,000,000)
Noncash items:
Reduction of secured borrowing and related collateral	5,000,000	3,000,000
Loans transferred to portfolio from held for sale	32,000,000	5,000,000
Loans transferred to held for sale from portfolio	292,000,000	290,000,000
Loans transferred to OREO	94,000,000	22,000,000
CMBS risk retentions	41,000,000	17,000,000
ABS risk retentions	$ 22,000,000	$ 12,000,000