Condensed Consolidated Statement of Changes in Equity (unaudited) - USD ($) $ in Millions		Total	Cumulative Effect, Period of Adoption, Adjustment	[1]	Cumulative Effect, Period of Adoption, Adjusted Balance	Preferred stock dividends — Series B	Preferred stock dividends — Series C	Common stock and paid-in capital	Common stock and paid-in capital Cumulative Effect, Period of Adoption, Adjusted Balance	Preferred stock	Preferred stock Cumulative Effect, Period of Adoption, Adjusted Balance	Retained earnings (accumulated deficit)	Retained earnings (accumulated deficit) Cumulative Effect, Period of Adoption, Adjustment	[1]	Retained earnings (accumulated deficit) Cumulative Effect, Period of Adoption, Adjusted Balance	Retained earnings (accumulated deficit) Preferred stock dividends — Series B	Retained earnings (accumulated deficit) Preferred stock dividends — Series C	Accumulated other comprehensive loss	Accumulated other comprehensive loss Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury stock	Treasury stock Cumulative Effect, Period of Adoption, Adjusted Balance
Beginning balance at Dec. 31, 2022		$ 12,859						$ 21,816		$ 2,324		$ (384)						$ (4,059)		$ (6,838)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		648										648
Preferred stock dividends						$ (32)	$ (24)									$ (32)	$ (24)
Share-based compensation		99						99
Other comprehensive income (loss)		196																196
Common stock repurchases		(29)																		(29)
Common stock dividends		(185)										(185)
Ending balance at Jun. 30, 2023		13,532						21,915		2,324		23						(3,863)		(6,867)
Beginning balance at Dec. 31, 2022		12,859						21,816		2,324		(384)						(4,059)		(6,838)
Ending balance at Dec. 31, 2023		$ 13,766	$ (2)		$ 13,764			21,975	$ 21,975	2,324	$ 2,324	154	$ (2)		$ 152			(3,816)	$ (3,816)	(6,871)	$ (6,871)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible Enumeration]	[1]	Accounting Standards Update 2023-02
Beginning balance at Mar. 31, 2023		$ 13,378						21,880		2,324		(185)						(3,776)		(6,865)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		329										329
Preferred stock dividends						(16)	(12)									(16)	(12)
Share-based compensation		35						35
Other comprehensive income (loss)		(87)																(87)
Common stock repurchases		(2)																		(2)
Common stock dividends		(93)										(93)
Ending balance at Jun. 30, 2023		13,532						21,915		2,324		23						(3,863)		(6,867)
Beginning balance at Dec. 31, 2023		13,766	$ (2)		$ 13,764			21,975	$ 21,975	2,324	$ 2,324	154	$ (2)		$ 152			(3,816)	$ (3,816)	(6,871)	$ (6,871)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		451										451
Preferred stock dividends						(32)	(24)									(32)	(24)
Share-based compensation		102						102
Other comprehensive income (loss)		(193)																(193)
Common stock repurchases		(30)																		(30)
Common stock dividends		(187)										(187)
Ending balance at Jun. 30, 2024		13,851						22,077		2,324		360						(4,009)		(6,901)
Beginning balance at Mar. 31, 2024		13,657						22,034		2,324		188						(3,989)		(6,900)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		294										294
Preferred stock dividends						$ (16)	$ (12)									$ (16)	$ (12)
Share-based compensation		43						43
Other comprehensive income (loss)		(20)																(20)
Common stock repurchases		(1)																		(1)
Common stock dividends		(94)										(94)
Ending balance at Jun. 30, 2024		$ 13,851						$ 22,077		$ 2,324		$ 360						$ (4,009)		$ (6,901)

[1] Refer to the section titled Recently Adopted Accounting Standards in Note 1 for additional information.