Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended							12 Months Ended			64 Months Ended	119 Months Ended	121 Months Ended
	Feb. 08, 2024	Mar. 31, 2024	Feb. 29, 2024	Jan. 31, 2024	Sep. 30, 2018	Apr. 30, 2016	May 31, 2015	Feb. 28, 2014	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Sep. 14, 2020	Mar. 14, 2026	Mar. 14, 2024	Jan. 19, 2024	Jan. 31, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Preferred stock cash dividend									$ 122	$ 112	$ 114
2021 Share Repurchase Program
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount of common stock authorized for repurchase										$ 3,000
Shares acquired (in shares)									0	19,500,000
Total acquired									$ 0	$ 1,500
2023 Share Repurchase Program
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount of common stock authorized for repurchase																$ 4,500
Shares acquired (in shares)									49,200,000	0
Total acquired									$ 3,800	$ 0
2024 Share Repurchase Program | Subsequent Event
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount of common stock authorized for repurchase															$ 5,000
Series F Preferred Stock
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shares issued (in shares)							250,000
Ownership Interest Per Depositary Share							1.00%
Liquidation preference per share (USD per share)							$ 100,000
Per annum dividend rate												3.859%
Preferred stock, shares outstanding (in shares)									2,500
Preferred dividends declared (USD per share)									$ 8,935	$ 5,208
Preferred stock cash dividend									$ 23	$ 13
Series F Preferred Stock | Subsequent Event
Accumulated Other Comprehensive Income (Loss) [Line Items]
Liquidation preference per share (USD per share)	$ 100,000
Redemption price	$ 1,000
Preferred stock, shares outstanding (in shares)	2,500
Preferred dividends declared (USD per share)	$ 2,336		$ 2,336
Series F Preferred Stock | Forecast
Accumulated Other Comprehensive Income (Loss) [Line Items]
Preferred stock cash dividend		$ 6
Series F Preferred Stock, Depository Share
Accumulated Other Comprehensive Income (Loss) [Line Items]
Liquidation preference per share (USD per share)							$ 1,000
Preferred dividends declared (USD per share)									$ 89.35	$ 52.08
Series F Preferred Stock, Depository Share | Subsequent Event
Accumulated Other Comprehensive Income (Loss) [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)	$ 23.36		23.36
Series D Preferred Stock
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ownership Interest Per Depositary Share								0.025%
Liquidation preference per share (USD per share)								$ 100,000
Preferred stock, shares outstanding (in shares)									7,500
Preferred dividends declared (USD per share)									$ 5,900	$ 5,900
Preferred stock cash dividend									$ 44	$ 44
Series D Preferred Stock | Subsequent Event
Accumulated Other Comprehensive Income (Loss) [Line Items]
Liquidation preference per share (USD per share)	$ 100,000
Preferred stock, shares outstanding (in shares)	7,500
Preferred dividends declared (USD per share)	$ 1,475		1,475
Series D Preferred Stock | Forecast
Accumulated Other Comprehensive Income (Loss) [Line Items]
Per annum dividend rate														5.90%
Preferred stock cash dividend		11
Series G Preferred Stock
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ownership Interest Per Depositary Share						0.025%
Liquidation preference per share (USD per share)						$ 100,000
Preferred stock, shares outstanding (in shares)									5,000
Preferred dividends declared (USD per share)									$ 5,350	$ 5,352
Preferred stock cash dividend									$ 27	$ 27
Series G Preferred Stock | Subsequent Event
Accumulated Other Comprehensive Income (Loss) [Line Items]
Preferred dividends declared (USD per share)			1,338
Series G Preferred Stock | Forecast
Accumulated Other Comprehensive Income (Loss) [Line Items]
Per annum dividend rate													5.35%
Preferred stock cash dividend		7
Series D Preferred Stock, Depository Share
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shares issued (in shares)								30,000,000
Liquidation preference per share (USD per share)								$ 25
Preferred dividends declared (USD per share)									$ 1.48	$ 1.48
Series D Preferred Stock, Depository Share | Subsequent Event
Accumulated Other Comprehensive Income (Loss) [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)	$ 0.37		0.37
Series G Preferred Stock, Depository Share
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shares issued (in shares)						20,000,000
Liquidation preference per share (USD per share)						$ 25
Preferred dividends declared (USD per share)									$ 1.34	1.32
Series G Preferred Stock, Depository Share | Subsequent Event
Accumulated Other Comprehensive Income (Loss) [Line Items]
Preferred dividends declared (USD per share)			0.33
Series H Preferred Stock
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ownership Interest Per Depositary Share					1.00%
Liquidation preference per share (USD per share)																	$ 100,000
Per annum dividend rate												2.801%
Preferred stock, shares outstanding (in shares)									5,000
Preferred dividends declared (USD per share)									$ 5,625	$ 5,625
Preferred stock cash dividend									$ 28	$ 28
Series H Preferred Stock | Subsequent Event
Accumulated Other Comprehensive Income (Loss) [Line Items]
Preferred dividends declared (USD per share)			2,069
Series H Preferred Stock | Forecast
Accumulated Other Comprehensive Income (Loss) [Line Items]
Preferred stock cash dividend		$ 10
Series H Preferred Stock, Depository Share
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shares issued (in shares)					500,000
Liquidation preference per share (USD per share)																	$ 1,000
Preferred dividends declared (USD per share)									$ 56.25	$ 56.25
Series H Preferred Stock, Depository Share | Subsequent Event
Accumulated Other Comprehensive Income (Loss) [Line Items]
Preferred dividends declared (USD per share)			$ 20.69
Series I Preferred Stock | Subsequent Event
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shares issued (in shares)				1,500,000
Liquidation preference per share (USD per share)				$ 100,000
Per annum dividend rate				6.70%
Series I Preferred Stock, Depository Share | Subsequent Event
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shares issued (in shares)				1,500,000
Ownership Interest Per Depositary Share				1.00%
Liquidation preference per share (USD per share)				$ 1,000
Proceeds from issuance of preferred stock, net of issuance costs				$ 1,500