CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) - 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, 2022			2,000,000	492,000,000
Beginning 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 to common stockholders	(410)					(410)
Dividends to preferred stockholders	$ (57)					(57)
Treasury stock purchased (in shares)	(19,736,783)			(20,000,000)
Treasury stock purchased	$ (656)							(656)
Share repurchase excise tax	(7)							(7)
Share-based compensation plans (in shares)				3,000,000
Share-based compensation plans	51				51
Employee stock purchase plan	14				14
Total comprehensive income (loss):
Net income	989					989
Other comprehensive income (loss)	(3)								(3)
Total comprehensive income (loss)	986					989			(3)
Ending balance (in shares) at Jun. 30, 2023			2,000,000	475,000,000
Ending balance at Jun. 30, 2023	23,585		$ 2,014	$ 6	22,207	9,655		(5,734)	(4,563)
Beginning balance (in shares) at Mar. 31, 2023			2,000,000	484,000,000
Beginning balance at Mar. 31, 2023	24,201		$ 2,014	$ 6	22,183	9,416		(5,475)	(3,943)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends to common stockholders	(205)					(205)
Dividends to preferred stockholders	(34)					(34)
Treasury stock purchased (in shares)				(10,000,000)
Treasury stock purchased	(256)							(256)
Share repurchase excise tax	(3)							(3)
Share-based compensation plans (in shares)				1,000,000
Share-based compensation plans	18				18
Employee stock purchase plan	6				6
Total comprehensive income (loss):
Net income	478					478
Other comprehensive income (loss)	(620)								(620)
Total comprehensive income (loss)	(142)					478			(620)
Ending balance (in shares) at Jun. 30, 2023			2,000,000	475,000,000
Ending balance at Jun. 30, 2023	23,585		$ 2,014	$ 6	22,207	9,655		(5,734)	(4,563)
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 to common stockholders	(391)					(391)
Dividends to preferred stockholders	(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 to common stockholders	(194)					(194)
Dividends to preferred stockholders	(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)