CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Millions	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock, at Cost	Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2023		2,000,000	466,000,000
Beginning 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	(581)				(581)
Dividends declared - preferred stock	(103)				(103)
Preferred stock issued	391	391
Preferred stock redemption	$ (300)	$ (293)			(7)
Treasury stock purchased (in shares)	(23,006,560)		(23,000,000)
Treasury stock purchased	$ (825)					(825)
Share repurchase excise tax	(9)					(9)
Share-based compensation plans (in shares)			2,000,000
Share-based compensation plans	57			57
Employee stock purchase plan	20			20
Total comprehensive income (loss):
Net income	1,108				1,108
Other comprehensive income (loss)	832						832
Total comprehensive income (loss)	1,940				1,108		832
Ending balance (in shares) at Sep. 30, 2024		2,000,000	445,000,000
Ending balance at Sep. 30, 2024	24,932	$ 2,112	$ 6	22,327	10,233	(6,820)	(2,926)
Beginning balance (in shares) at Jun. 30, 2024		2,000,000	453,000,000
Beginning balance at Jun. 30, 2024	23,869	$ 2,112	$ 6	22,299	10,079	(6,492)	(4,135)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared - common stock	(190)				(190)
Dividends declared - preferred stock	(38)				(38)
Treasury stock purchased (in shares)			(8,000,000)
Treasury stock purchased	(325)					(325)
Share repurchase excise tax	(3)					(3)
Share-based compensation plans	21			21
Employee stock purchase plan	7			7
Total comprehensive income (loss):
Net income	382				382
Other comprehensive income (loss)	1,209						1,209
Total comprehensive income (loss)	1,591				382		1,209
Ending balance (in shares) at Sep. 30, 2024		2,000,000	445,000,000
Ending balance at Sep. 30, 2024	24,932	$ 2,112	$ 6	22,327	10,233	(6,820)	(2,926)
Beginning balance (in shares) at Dec. 31, 2024		2,000,000	441,000,000
Beginning balance at Dec. 31, 2024	24,254	$ 2,113	$ 7	22,364	10,412	(7,047)	(3,595)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared - common stock	(555)				(555)
Dividends declared - preferred stock	(99)				(99)
Preferred stock issued	393	393
Preferred stock redemption	$ (400)	$ (395)			(5)
Treasury stock purchased (in shares)	(11,129,200)		(12,000,000)
Treasury stock purchased	$ (475)					(475)
Share repurchase excise tax	(4)					(4)
Share-based compensation plans (in shares)			2,000,000
Share-based compensation plans	62			62
Employee stock purchase plan	22			22
Total comprehensive income (loss):
Net income	1,303				1,303
Other comprehensive income (loss)	1,328						1,328
Total comprehensive income (loss)	2,631				1,303		1,328
Ending balance (in shares) at Sep. 30, 2025		2,000,000	431,000,000
Ending balance at Sep. 30, 2025	25,829	$ 2,111	$ 7	22,448	11,056	(7,526)	(2,267)
Beginning balance (in shares) at Jun. 30, 2025		2,000,000	433,000,000
Beginning balance at Jun. 30, 2025	25,234	$ 2,113	$ 7	22,420	10,783	(7,450)	(2,639)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared - common stock	(184)				(184)
Dividends declared - preferred stock	(32)				(32)
Preferred stock issued	393	393
Preferred stock redemption	(400)	$ (395)			(5)
Treasury stock purchased (in shares)			(2,000,000)
Treasury stock purchased	(75)					(75)
Share repurchase excise tax	(1)					(1)
Share-based compensation plans	21			21
Employee stock purchase plan	7			7
Total comprehensive income (loss):
Net income	494				494
Other comprehensive income (loss)	372						372
Total comprehensive income (loss)	866				494		372
Ending balance (in shares) at Sep. 30, 2025		2,000,000	431,000,000
Ending balance at Sep. 30, 2025	$ 25,829	$ 2,111	$ 7	$ 22,448	$ 11,056	$ (7,526)	$ (2,267)