Shareholders' Equity - Schedule of Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended
	Jul. 24, 2024	Jan. 31, 2024	Jul. 31, 2024	Jan. 31, 2024	Apr. 30, 2016	Dec. 31, 2024	Dec. 31, 2023
Series I Preferred Stock
Class of Stock [Line Items]
Shares issued (in shares)		1,500,000
Ownership Interest Per Depositary Share				1.00%
Liquidation preference per share (USD per share)		$ 100,000		$ 100,000
Per annum dividend rate				6.70%
Per annum dividend rate, basis spread on variable rate				2.613%
Preferred stock						$ 1,481	$ 0
Reset period				5 years
Series I Preferred Stock, Depository Share
Class of Stock [Line Items]
Shares issued (in shares)				1,500,000
Liquidation preference per share (USD per share)		$ 1,000		$ 1,000
Depositary Shares, each representing a 1/4,000th ownership interest in a share of Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series G, without par value per share
Class of Stock [Line Items]
Shares issued (in shares)					20,000,000
Liquidation preference per share (USD per share)					$ 25
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						493	493
Series J Preferred Stock, Depository Share
Class of Stock [Line Items]
Shares issued (in shares)			850,000
Liquidation preference per share (USD per share)	$ 1,000		$ 1,000
Series J Preferred Stock
Class of Stock [Line Items]
Shares issued (in shares)	850,000
Ownership Interest Per Depositary Share			1.00%
Liquidation preference per share (USD per share)	$ 100,000		$ 100,000
Per annum dividend rate			6.70%
Per annum dividend rate, basis spread on variable rate			2.628%
Preferred stock						$ 842	$ 0
Reset period			5 years