Shareholders' Equity - Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2026	Mar. 31, 2026	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2026	Jun. 30, 2025
Class of Stock [Line Items]
Preferred stock cash dividend	$ 58	$ 58	$ 63	$ 46	$ 116	$ 109
Series G Preferred Stock
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 1,367		$ 1,338		$ 2,705	$ 2,675
Preferred stock cash dividend	$ 7		$ 6		$ 14	$ 13
Series G Preferred Stock, Depository Share
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 0.34		$ 0.33		$ 0.68	$ 0.67
Series I Preferred Stock
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 1,675		$ 1,675		$ 3,350	$ 3,350
Preferred stock cash dividend	$ 25		$ 25		$ 50	$ 50
Series I Preferred Stock, Depository Share
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 16.75		$ 16.75		$ 33.50	$ 33.50
Series J Preferred Stock
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 1,675		$ 1,675		$ 3,350	$ 3,350
Preferred stock cash dividend	$ 14		$ 15		$ 28	$ 29
Series J Preferred Stock, Depository Share
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 16.75		$ 16.75		$ 33.50	$ 33.50
Series K Preferred Stock
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 1,613		$ 2,311		$ 3,225	$ 2,311
Preferred stock cash dividend	$ 12		$ 17		$ 24	$ 17
Series K Preferred Stock, Depository Share
Class of Stock [Line Items]
Preferred dividends declared (USD per share)	$ 16.13		$ 23.11		$ 32.25	$ 23.11