Consolidated Statements of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income		$ 596	$ 511	$ 395
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses		3	62	7
Depreciation		21	24	27
Amortization of discounts and premiums, net		(5)	11	8
Net (gain) loss on securities			(2)	(8)
Net loss (gain) on sales of loans		(1)
Net gain on sales of fixed assets				(8)
Stock-based compensation		31	29	32
Deferred tax expense		(13)	219	101
Changes in operating assets and liabilities:
(Increase) decrease in other assets	[1]	(284)	(411)	(56)
Increase (decrease) in other liabilities	[2]	(6)	9	11
Purchases of securities held for trading		(110)	(15)	(43)
Proceeds from sales of securities held for trading		110	15	43
Origination of loans held for sale		(52)	(119)
Net cash provided by operating activities		290	334	510
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from repayment of securities available for sale		1,728	2,062	1,962
Proceeds from sales of securities available for sale			484	361
Purchase of securities available for sale		(1,796)	(2,514)	(2,503)
Redemption of Federal Home Loan Bank stock		92	173	136
Purchases of Federal Home Loan Bank stock		(112)	(239)	(139)
Proceeds from (purchases of) bank-owned life insurance, net		12	12	(138)
Proceeds from sales of loans		37	3	115
Purchases of loans		(161)	(95)	(864)
Other changes in loans, net		(2,558)	(912)	(998)
Dispositions (purchases) of premises and equipment, net		(4)	1	9
Net cash used in investing activities		(2,762)	(1,025)	(2,059)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in deposits		2,622	780	893
Net increase in short-term borrowed funds		950	1,150	1,100
Proceeds from long-term borrowed funds		2,072	6,925	4,786
Repayments of long-term borrowed funds		(2,544)	(6,550)	(5,538)
Cash dividends paid on common stock		(316)	(316)	(317)
Cash dividends paid on preferred stock		(33)	(33)	(33)
Treasury stock repurchased			(50)	(67)
Payments relating to treasury shares received for restricted stock award tax payments		(16)	(9)	(8)
Net cash provided by financing activities		2,735	1,897	816
Net increase (decrease) in cash, cash equivalents, and restricted cash		263	1,206	(733)
Cash, cash equivalents, and restricted cash at beginning of year		1,948	742	1,475
Cash, cash equivalents, and restricted cash at end of year		2,211	1,948	742
Supplemental information:
Cash paid for interest		402	633	813
Cash paid for income taxes		471	118	76
Non-cash investing and financing activities:
Transfers to repossessed assets from loans		1	1	5
Operating lease liabilities arising from obtaining right-of-use assets as of January 1, 2019				324
Securitization of residential mortgage loans to mortgage-backed securities available for sale		161	53	94
Transfer of loans from held for investment to held for sale		52		115
Transfer of loans from held for sale to held for investment		94
Disposition of premises and equipment				1
Shares issued for restricted stock awards		$ 28	$ 22	$ 17

[1] Includes $18 million, $20 million, and $38 million of net amortization of operating lease right-of-use assets for the twelve months ended December 31, 2021, December 31, 2020, and December 31, 2019, respectively.

[2] Includes $18 million, $20 million, and $38 million of net amortization of operating lease liability for the twelve months ended December 31, 2021, December 31, 2020, and December 31, 2019, respectively.