CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)		Mar. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Debt securities available for sale, amortized cost		$ 3,600,000,000	$ 3,416,000,000
Debt securities available for sale, allowance for credit losses		0	0
Debt securities held-to-maturity, fair value		3,364,000,000	3,506,000,000
Debt securities held to maturity, allowance for credit losses		120,000	50,000.00
Loans held for sale, fair value	[1]	214,000,000	269,000,000
Loans and leases, unearned income		$ 36,000,000	$ 36,000,000
Preferred stock, par value (in dollars per share)		$ 0.01	$ 0.01
Preferred stock, liquidation preference per share (in dollars per share)		$ 1,000	$ 1,000
Preferred stock, shares authorized (in shares)		20,000,000	20,000,000
Preferred stock, shares issued (in shares)		110,877	110,877
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01
Common stock, shares authorized (in shares)		500,000,000	500,000,000
Common stock, shares issued (in shares)		363,773,858	329,464,669
Treasury stock, shares (in shares)		12,862,828	10,531,177

[1] Amount represents loans for which we have elected the fair value option. See Note 19.