Consolidated Balance Sheets - USD ($) shares in Thousands, $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Held-to-maturity, Fair Value	$ 762
ASSETS
Cash and due from banks	536	$ 614
Money market investments:
Interest-bearing deposits	702	619
Federal funds sold and security resell agreements	438	1,461
Investment securities:
Available-for-sale, at fair value	14,904	14,737
Trading account, at fair value	316	106
Total investment securities	15,984	15,617
Loans held for sale	69	93
Loans held for investment, net of allowance
Loans and leases, net of unearned income and fees	47,606	46,714
Less allowance for loan losses	497	495
Loans held for investment, net of allowance	47,109	46,219
Other noninterest-bearing investments	993	1,046
Premises, equipment and software, net	1,125	1,124
Goodwill and intangibles	1,014	1,015
Other real estate owned	6	4
Other assets	1,219	934
Total assets	69,195	68,746
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing demand	23,259	23,645
Interest-bearing:
Savings and money market	26,348	26,120
Total deposits	54,535	54,101
Federal funds purchased and other short-term borrowings	4,944	5,653
Long-term Debt	1,228	724
Reserve for unfunded lending commitments	59	57
Other liabilities	841	633
Total liabilities	61,607	61,168
Shareholders' equity:
Preferred stock, without par value	566	566
Common Stock	0	0
Additional Paid-in Capital	3,541	3,806
Retained earnings	3,603	3,456
Accumulated other comprehensive income (loss)	(122)	(250)
Stockholders' Equity	7,588	7,578
Total liabilities and shareholders' equity	$ 69,195	$ 68,746
Preferred Stock, Shares Authorized	4,400	4,400
Common Stock, Shares Authorized	350,000	350,000
Common Stock, Shares, Issued	182,513	187,554
Common Stock, Shares, Outstanding	182,513	187,554
Fair Value, Inputs, Level 2 [Member]
Investment securities:
Held-to-maturity, at amortized cost	$ 764	$ 774
Trading account, at fair value	155	92
Interest-bearing:
Time	4,928	4,336
Long-term Debt	1,228	724
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Securities, Held-to-maturity, Fair Value	762	767
Interest-bearing:
Time	4,921	4,319
Long-term Debt	$ 1,240	$ 727