Regulatory Capital and Other Regulatory Matters (Common Share Repurchases) (Details) - USD ($)		3 Months Ended						9 Months Ended
	Oct. 10, 2022	Sep. 30, 2022		Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021		Sep. 30, 2022		Sep. 30, 2021		Jun. 30, 2022	Jan. 10, 2022	Jul. 12, 2021	Jun. 30, 2021	Mar. 31, 2021	Jan. 11, 2021	Dec. 31, 2020
Accelerated Share Repurchases [Line Items]
Cash dividends declared per common share (in dollars per share)		$ 0.30	[1]		$ 0.25	$ 0.25	[1]	$ 0.90	[1]	$ 0.63	[1]
Treasury stock, common, amount		$ 415,000,000		$ 584,000,000	$ 594,000,000	$ 679,000,000		$ 415,000,000		$ 679,000,000		$ 600,000,000			$ 502,000,000	$ 219,000,000
Treasury stock, common, shares (in shares)		12,468,000		12,548,000	12,046,000	13,055,000		12,468,000		13,055,000		15,031,000			9,641,000	5,276,000
Common stock, shares outstanding (in shares)		300,335,089		327,306,000	337,940,636	349,599,000		300,335,089		349,599,000		312,781,000			362,639,000	371,805,000		374,674,000
Dividends declared (in dollars per share)		$ 0.30		$ 0.30	$ 0.25	$ 0.25		$ 0.30		$ 0.25		$ 0.30			$ 0.19	$ 0.19
Subsequent event
Accelerated Share Repurchases [Line Items]
Cash dividends declared per common share (in dollars per share)	$ 0.30
Common stock
Accelerated Share Repurchases [Line Items]
Stock repurchase program, authorized amount													$ 2,000,000,000	$ 2,000,000,000			$ 1,600,000,000
Cash dividends declared per common share (in dollars per share)				$ 0.30
Treasury stock, common, amount		$ 1,600,000,000						$ 1,600,000,000
Series B Preferred Stock
Accelerated Share Repurchases [Line Items]
Gross proceeds from issuance of series preferred stock						$ 1,350,000,000
Series C Preferred Stock
Accelerated Share Repurchases [Line Items]
Gross proceeds from issuance of series preferred stock						$ 1,000,000,000

[1] Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers.