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Condensed Financial Information Parent Company Statements of Cash Flow (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating activities:      
Net income $ 1,582 $ 1,759 $ 1,263
Adjustments to reconcile net income to net cash from operating activities:      
Depreciation, amortization and accretion, net 426 462 537
Loss on early extinguishment of debt 16 0 0
Net change in operating assets and liabilities:      
Other assets (347) 171 (410)
Other liabilities 453 (470) 110
Other 177 37 48
Net cash from operating activities 2,581 2,275 2,297
Investing activities:      
Proceeds from sales and maturities of debt securities available for sale 3,532 3,383 3,575
Purchases of debt securities available for sale (8,102) (3,410) (4,404)
Proceeds from disposition of business, net of cash transferred 0 357 0
Net cash from investing activities 509 (3,045) (801)
Financing activities:      
Net change in short-term borrowings 450 1,100 500
Proceeds from long-term borrowings 21,274 21,750 6,649
Payments on long-term borrowings (25,926) (17,451) (6,255)
Cash dividends on common stock (577) (452) (346)
Cash dividends on preferred stock (79) (64) (64)
Proceeds from Issuance of Preferred Stock and Preference Stock 490    
Repurchases of common stock (1,101) (2,122) (1,275)
Other 0 (1) (7)
Net cash from financing activities (2,514) 327 (2,966)
Parent Company [Member]      
Operating activities:      
Net income 1,582 1,759 1,263
Adjustments to reconcile net income to net cash from operating activities:      
Equity In Undistributed Earnings Of Subsidiaries (124) 441 (102)
Depreciation, amortization and accretion, net 4 3 2
Loss on sale of assets 0 0 1
Loss on early extinguishment of debt 16 0 0
Discontinued Operation, (Gain) Loss from Disposal of Discontinued Operation, before Income Tax 0 (281) 0
Net change in operating assets and liabilities:      
Other assets 18 (35) (19)
Other liabilities (7) (8) 2
Other 122 31 41
Net cash from operating activities 1,611 1,910 1,188
Investing activities:      
(Investment in) / repayment of investment in subsidiaries (18) 146 142
Proceeds from sales and maturities of debt securities available for sale 5 8 9
Purchases of debt securities available for sale (6) (10) (6)
Net (purchases of) / proceeds from sales of assets 0 0 6
Proceeds from disposition of business, net of cash transferred 0 357 0
Other, net 0 0 2
Net cash from investing activities (19) 501 153
Financing activities:      
Net change in short-term borrowings 0 (101) 0
Proceeds from long-term borrowings 500 500 999
Payments on long-term borrowings (751) 0 0
Cash dividends on common stock (577) (452) (346)
Cash dividends on preferred stock (79) (64) (64)
Proceeds from Issuance of Preferred Stock and Preference Stock 490 0 0
Repurchases of common stock (1,101) (2,122) (1,275)
Other (2) (2) (5)
Net cash from financing activities (1,520) (2,241) (691)
Net change in cash and cash equivalents 72 170 650
Cash and cash equivalents at beginning of year 1,863 1,693 1,043
Cash and cash equivalents at end of year $ 1,935 $ 1,863 $ 1,693