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Investment Securities - Fair Value and Gross Unrealized Losses on Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Fair Value
Less than 12 months	$ 13,532	$ 2,964
12 months or more	26,055	29,029
Total	39,587	31,993
Unrealized Losses
Less than 12 months	(132)	(9)
12 months or more	(3,038)	(2,964)
Total	(3,170)	(2,973)
U.S. Treasury and federal agencies securities
Fair Value
Less than 12 months	1,442	1,225
12 months or more	0	0
Total	1,442	1,225
Unrealized Losses
Less than 12 months	(8)	0
12 months or more	0	0
Total	(8)	0
Agency mortgage-backed securities | Residential mortgage backed securities
Fair Value
Less than 12 months	8,675	1,454
12 months or more	4,382	4,615
Total	13,057	6,069
Unrealized Losses
Less than 12 months	(78)	(7)
12 months or more	(561)	(526)
Total	(639)	(533)
Agency mortgage-backed securities | Commercial mortgage-backed securities
Fair Value
Less than 12 months	2,934	149
12 months or more	17,769	19,826
Total	20,703	19,975
Unrealized Losses
Less than 12 months	(38)	(1)
12 months or more	(2,162)	(2,123)
Total	(2,200)	(2,124)
Non-agency commercial mortgage-backed securities | Commercial mortgage-backed securities
Fair Value
Less than 12 months	86	1
12 months or more	2,466	2,695
Total	2,552	2,696
Unrealized Losses
Less than 12 months	(1)	0
12 months or more	(207)	(200)
Total	(208)	(200)
Asset-backed securities and other debt securities
Fair Value
Less than 12 months	395	135
12 months or more	1,438	1,893
Total	1,833	2,028
Unrealized Losses
Less than 12 months	(7)	(1)
12 months or more	(108)	(115)
Total	$ (115)	$ (116)

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