CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock, at Cost	Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2021			2,000,000	422,000,000
Beginning balance at Dec. 31, 2021	$ 23,420		$ 2,014	$ 6	$ 19,005	$ 7,978		$ (4,918)	$ (665)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared - common stock	(779)					(779)
Dividends declared - preferred stock	(113)					(113)
Issuance of common stock - business acquisition (in shares)				72,000,000
Issuance of common stock - business acquisition	3,036				3,036
Treasury stock purchased (in shares)				(4,000,000)
Treasury stock purchased	(153)							(153)
Share-based compensation plans (in shares)				2,000,000
Share-based compensation plans	77				77
Employee stock purchase plan	24				24
Total comprehensive income (loss):
Net income	2,073					2,073
Other comprehensive income (loss)	(3,895)								(3,895)
Total comprehensive income (loss)	(1,822)					2,073			(3,895)
Ending balance (in shares) at Dec. 31, 2022			2,000,000	492,000,000
Ending balance at Dec. 31, 2022	23,690	$ (26)	$ 2,014	$ 6	22,142	9,159	$ (26)	(5,071)	(4,560)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared - common stock	(808)					(808)
Dividends declared - preferred stock	$ (117)					(117)
Treasury stock purchased (in shares)	(28,473,805)			(29,000,000)
Treasury stock purchased	$ (906)							(906)
Share repurchase excise tax	(9)							(9)
Share-based compensation plans (in shares)				2,000,000
Share-based compensation plans	81				81
Employee stock purchase plan (in shares)				1,000,000
Employee stock purchase plan	27				27
Total comprehensive income (loss):
Net income	1,608					1,608
Other comprehensive income (loss)	802								802
Total comprehensive income (loss)	2,410					1,608			802
Ending balance (in shares) at Dec. 31, 2023			2,000,000	466,000,000
Ending balance at Dec. 31, 2023	24,342		$ 2,014	$ 6	22,250	9,816		(5,986)	(3,758)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared - common stock	(769)					(769)
Dividends declared - preferred stock	(137)					(137)
Preferred stock issued	392		392
Preferred stock redemption	$ (300)		$ (293)			(7)
Treasury stock purchased (in shares)	(28,113,278)			(28,000,000)
Treasury stock purchased	$ (1,050)							(1,050)
Share repurchase excise tax	(11)							(11)
Share-based compensation plans (in shares)				2,000,000
Share-based compensation plans	90			$ 1	89
Employee stock purchase plan (in shares)				1,000,000
Employee stock purchase plan	25				25
Total comprehensive income (loss):
Net income	1,509					1,509
Other comprehensive income (loss)	163								163
Total comprehensive income (loss)	1,672					1,509			163
Ending balance (in shares) at Dec. 31, 2024			2,000,000	441,000,000
Ending balance at Dec. 31, 2024	$ 24,254		$ 2,113	$ 7	$ 22,364	$ 10,412		$ (7,047)	$ (3,595)