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	(391)				(391)
Dividends declared - preferred stock	(65)				(65)
Preferred stock issued	391	391
Preferred stock redemption	$ (300)	$ (293)			(7)
Treasury stock purchased (in shares)	(15,000,188)		(15,000,000)
Treasury stock purchased	$ (500)					(500)
Share repurchase excise tax	(6)					(6)
Share-based compensation plans (in shares)			2,000,000
Share-based compensation plans	36			36
Employee stock purchase plan	13			13
Total comprehensive income (loss):
Net income	726				726
Other comprehensive income (loss)	(377)						(377)
Total comprehensive income (loss)	349				726		(377)
Ending balance (in shares) at Jun. 30, 2024		2,000,000	453,000,000
Ending balance at Jun. 30, 2024	23,869	$ 2,112	$ 6	22,299	10,079	(6,492)	(4,135)
Beginning balance (in shares) at Mar. 31, 2024		2,000,000	458,000,000
Beginning balance at Mar. 31, 2024	23,761	$ 2,014	$ 6	22,272	9,923	(6,290)	(4,164)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared - common stock	(194)				(194)
Dividends declared - preferred stock	(35)				(35)
Preferred stock issued	391	391
Preferred stock redemption	(300)	$ (293)			(7)
Treasury stock purchased (in shares)			(6,000,000)
Treasury stock purchased	(200)					(200)
Share repurchase excise tax	(2)					(2)
Share-based compensation plans (in shares)			1,000,000
Share-based compensation plans	21			21
Employee stock purchase plan	6			6
Total comprehensive income (loss):
Net income	392				392
Other comprehensive income (loss)	29						29
Total comprehensive income (loss)	421				392		29
Ending balance (in shares) at Jun. 30, 2024		2,000,000	453,000,000
Ending balance at Jun. 30, 2024	23,869	$ 2,112	$ 6	22,299	10,079	(6,492)	(4,135)
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	(371)				(371)
Dividends declared - preferred stock	$ (67)				(67)
Treasury stock purchased (in shares)	(9,612,964)		(10,000,000)
Treasury stock purchased	$ (400)					(400)
Share repurchase excise tax	(3)					(3)
Share-based compensation plans (in shares)			2,000,000
Share-based compensation plans	41			41
Employee stock purchase plan	15			15
Total comprehensive income (loss):
Net income	809				809
Other comprehensive income (loss)	956						956
Total comprehensive income (loss)	1,765				809		956
Ending balance (in shares) at Jun. 30, 2025		2,000,000	433,000,000
Ending balance at Jun. 30, 2025	25,234	$ 2,113	$ 7	22,420	10,783	(7,450)	(2,639)
Beginning balance (in shares) at Mar. 31, 2025		2,000,000	438,000,000
Beginning balance at Mar. 31, 2025	24,866	$ 2,113	$ 7	22,370	10,566	(7,249)	(2,941)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared - common stock	(185)				(185)
Dividends declared - preferred stock	(34)				(34)
Treasury stock purchased (in shares)			(6,000,000)
Treasury stock purchased	(200)					(200)
Share repurchase excise tax	(1)					(1)
Share-based compensation plans (in shares)			1,000,000
Share-based compensation plans	42			42
Employee stock purchase plan	8			8
Total comprehensive income (loss):
Net income	436				436
Other comprehensive income (loss)	302						302
Total comprehensive income (loss)	738				436		302
Ending balance (in shares) at Jun. 30, 2025		2,000,000	433,000,000
Ending balance at Jun. 30, 2025	$ 25,234	$ 2,113	$ 7	$ 22,420	$ 10,783	$ (7,450)	$ (2,639)