Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Feb. 23, 2023	Dec. 31, 2022	Jun. 30, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Preferred stock, authorized shares (in shares)		4,400,000		4,400,000	4,400,000
Liquidation preference of preferred stock (per share)		$ 1,000		$ 1,000
Preferred stock, liquidation preference per depositary share (in dollars per share)		$ 25		$ 25
Depositary share, preferred stock ownership interest				0.025%
Stock redemption					$ 126
Shares outstanding (in shares)		148,700,000		148,700,000
Common stock, par value (in dollars per share)		$ 0.001		$ 0.001	$ 0.001
Common stock and additional paid-in capital		$ 1,800		$ 1,800
Common stock and additional paid-in capital decrease		$ 174		$ 174
Common stock and additional paid-in capital decrease (as a percent)		9.00%		9.00%
Common stock repurchased (in shares)				3,600,000	13,500,000
Fair value of stock repurchased				$ 200	$ 800
Average price per share of stock repurchased (in dollars per share)				$ 56.13	$ 59.27
Other comprehensive income (loss)				$ (3,032)	$ (405)	$ 282
Accumulated other comprehensive income (loss)		$ (3,112)		(3,112)	(80)
Transfer from available for sale to held-to-maturity, fair value		10,700		10,691
Investment securities available-for-sale transferred to held-to-maturity, at amortized cost (fair value $10,691)		13,100		13,097	0	0
Common stock held in trust		14		14	13
Total invested assets of trusts		114		114	138
Total obligations of trusts		$ 128		128	151
Fair value of stock repurchased				$ 202	$ 800	$ 76
Subsequent Event
Schedule of Equity Method Investments [Line Items]
Common stock repurchased (in shares)	946,644
Fair value of stock repurchased	$ 50
Average price per share of stock repurchased (in dollars per share)	$ 52.82
Series H Preferred Stock
Schedule of Equity Method Investments [Line Items]
Preferred stock dividend rate			5.75%
Stock redemption			$ 126