Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended			3 Months Ended				6 Months Ended
	Jul. 24, 2024	Jan. 31, 2024	Jan. 31, 2024	Sep. 30, 2018	Apr. 30, 2016	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023	Mar. 15, 2024	Jan. 19, 2024	Dec. 31, 2023
Class of Stock [Line Items]
Proceeds from issuance of preferred stock, net of issuance costs										$ 1,481	$ 0
Preferred stock cash dividend						$ 55	$ 34	$ 37	$ 23	$ 89	$ 60
Series I Preferred Stock
Class of Stock [Line Items]
Preferred stock issued (shares)		1,500,000
Ownership Interest Per Depositary Share			1.00%
Liquidation preference per share (USD per share)		$ 100,000	$ 100,000
Proceeds from issuance of preferred stock, net of issuance costs		$ 1,500
Per annum dividend rate			6.70%
Preferred stock, shares outstanding (in shares)						15,000				15,000				15,000
Preferred dividends declared (USD per share)						$ 2,513		$ 0		$ 2,513	$ 0
Preferred stock cash dividend						$ 38		$ 0		$ 38	$ 0
Series I Preferred Stock | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 1,675
Preferred stock cash dividend	$ 25
Series I Preferred Stock, Depository Share
Class of Stock [Line Items]
Preferred stock issued (shares)			1,500,000
Ownership Interest Per Depositary Share			1.00%
Liquidation preference per share (USD per share)		$ 1,000	$ 1,000
Preferred dividends declared (USD per share)						$ 25.13		$ 0		$ 25.13	$ 0
Series I Preferred Stock, Depository Share | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 16.75
Series F Preferred Stock
Class of Stock [Line Items]
Liquidation preference per share (USD per share)												$ 100,000
Redemption price												$ 1,000
Preferred stock, shares outstanding (in shares)						2,500				2,500		2,500		2,500
Preferred dividends declared (USD per share)						$ 0		$ 2,163		$ 2,336	$ 4,254
Preferred stock cash dividend						$ 0		$ 5		$ 6	$ 11
Series D Preferred Stock
Class of Stock [Line Items]
Liquidation preference per share (USD per share)												$ 100,000
Preferred stock, shares outstanding (in shares)						7,500				7,500		7,500		7,500
Preferred dividends declared (USD per share)						$ 0		$ 1,475		$ 1,475	$ 2,950
Preferred stock cash dividend						$ 0		$ 11		$ 11	$ 22
Series D Preferred Stock, Depository Share
Class of Stock [Line Items]
Liquidation preference per share (USD per share)												$ 25
Preferred stock, shares outstanding (in shares)												30,000,000
Preferred dividends declared (USD per share)						$ 0		$ 0.37		$ 0.37	$ 0.74
Series F Preferred Stock, Depository Share
Class of Stock [Line Items]
Liquidation preference per share (USD per share)												$ 1,000
Preferred stock, shares outstanding (in shares)												250,000
Preferred dividends declared (USD per share)						$ 0		21.63		$ 23.36	42.54
Series J Preferred Stock | Subsequent Event
Class of Stock [Line Items]
Preferred stock issued (shares)	850,000
Liquidation preference per share (USD per share)	$ 100,000
Proceeds from issuance of preferred stock, net of issuance costs	$ 842
Per annum dividend rate	6.70%
Series J Preferred Stock, Depository Share | Subsequent Event
Class of Stock [Line Items]
Ownership Interest Per Depositary Share	1.00%
Liquidation preference per share (USD per share)	$ 1,000
Series G Preferred Stock
Class of Stock [Line Items]
Ownership Interest Per Depositary Share					0.025%
Liquidation preference per share (USD per share)					$ 100,000
Per annum dividend rate					5.35%
Preferred stock, shares outstanding (in shares)						5,000				5,000				5,000
Preferred dividends declared (USD per share)						$ 1,338		$ 1,338		$ 2,675	$ 2,675
Preferred stock cash dividend						$ 6		$ 7		$ 13	$ 13
Series G Preferred Stock | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 1,338
Preferred stock cash dividend	$ 7
Series H Preferred Stock
Class of Stock [Line Items]
Ownership Interest Per Depositary Share				1.00%
Liquidation preference per share (USD per share)				$ 100,000
Per annum dividend rate				8.185%
Preferred stock, shares outstanding (in shares)						5,000				5,000				5,000
Preferred dividends declared (USD per share)						$ 2,145		$ 2,813		$ 4,214	$ 2,813
Preferred stock cash dividend						$ 11		$ 14		$ 21	$ 14
Series H Preferred Stock | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 2,036
Preferred stock cash dividend	$ 10
Series G Preferred Stock, Depository Share
Class of Stock [Line Items]
Preferred stock issued (shares)					20,000,000
Liquidation preference per share (USD per share)					$ 25
Preferred dividends declared (USD per share)						$ 0.33		$ 0.33		$ 0.67	$ 0.66
Series G Preferred Stock, Depository Share | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 0.33
Series H Preferred Stock, Depository Share
Class of Stock [Line Items]
Preferred stock issued (shares)				500,000
Liquidation preference per share (USD per share)				$ 1,000
Preferred dividends declared (USD per share)						$ 21.45		$ 28.13		$ 42.14	$ 28.13
Series H Preferred Stock, Depository Share | Subsequent Event
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 20.36
2024 Share Repurchase Program
Class of Stock [Line Items]
Amount of common stock authorized for repurchase													$ 5,000
Total Acquired (In millions)						$ 200		$ 0		$ 300	$ 0