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Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Available-for-sale:
Amortized cost	$ 100,656	$ 89,627
Gains	341	143
Losses	1,008	1,739
Fair value	99,989	88,031
Amortized cost, before Portfolio level basis adjustment	100,592	89,719
Gross unrealized gains, before portfolio level basis adjustments	405
Gross unrealized losses, before portfolio level basis adjustments		1,831
Portfolio level basis adjustment, excluded from amortized cost	64	(92)
Portfolio level basis adjustments, gross unrealized gains (losses)	64	(92)
Held-to-maturity:
Amortized cost	49,539	48,596
Gains	75	15
Losses	3,100	4,591
Fair value	46,514	44,020
Amortized cost, Total	150,195	138,223
Gross unrealized, Gain, Total	416	158
Gross unrealized, Losses, Total	4,108	6,330
Fair value, Total	146,503	132,051
Non-U.S. government
Available-for-sale:
Amortized cost	28,590	25,042
Gains	98	61
Losses	193	356
Fair value	28,495	24,747
Held-to-maturity:
Amortized cost	5,815	4,479
Gains	25	8
Losses	21	36
Fair value	5,819	4,451
Agency residential mortgage-backed securities (“RMBS”)
Available-for-sale:
Amortized cost	21,130	20,459
Gains	171	16
Losses	284	575
Fair value	21,017	19,900
Held-to-maturity:
Amortized cost	26,439	25,824
Gains	29	4
Losses	2,521	3,545
Fair value	23,947	22,283
U.S. Treasury
Available-for-sale:
Amortized cost	24,232	16,575
Gains	69	9
Losses	75	181
Fair value	24,226	16,403
Held-to-maturity:
Amortized cost	8,818	8,833
Gains	13	0
Losses	218	443
Fair value	8,613	8,390
Foreign covered bonds
Available-for-sale:
Amortized cost	7,779	7,129
Gains	42	33
Losses	59	94
Fair value	7,762	7,068
Held-to-maturity:
Amortized cost	734	555
Gains	3	1
Losses	0	1
Fair value	737	555
Agency commercial mortgage-backed securities (“MBS”)
Available-for-sale:
Amortized cost	6,920	7,467
Gains	10	5
Losses	145	247
Fair value	6,785	7,225
Held-to-maturity:
Amortized cost	3,017	3,395
Gains	2	0
Losses	138	243
Fair value	2,881	3,152
Collateralized loan obligations (“CLOs”)
Available-for-sale:
Amortized cost	6,122	5,809
Gains	5	10
Losses	2	0
Fair value	6,125	5,819
Held-to-maturity:
Amortized cost	1,971	1,816
Gains	3	2
Losses	2	0
Fair value	1,972	1,818
Non-agency commercial MBS
Available-for-sale:
Amortized cost	2,305	2,641
Gains	1	2
Losses	96	156
Fair value	2,210	2,487
U.S. government agencies
Available-for-sale:
Amortized cost	1,555	2,304
Gains	6	4
Losses	1	19
Fair value	1,560	2,289
Held-to-maturity:
Amortized cost	2,734	3,669
Gains	0	0
Losses	199	322
Fair value	2,535	3,347
Non-agency RMBS
Available-for-sale:
Amortized cost	1,533	1,639
Gains	2	2
Losses	128	163
Fair value	1,407	1,478
Held-to-maturity:
Amortized cost		14
Gains		0
Losses		0
Fair value		14
Other asset-backed securities (“ABS”)
Available-for-sale:
Amortized cost	426	654
Gains	1	1
Losses	25	40
Fair value	402	615
Other debt securities
Held-to-maturity:
Amortized cost	11	11
Gains	0	0
Losses	1	1
Fair value	$ 10	$ 10

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