OTHER COMPREHENSIVE INCOME - Activity/Roll Forward (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
After-tax
Unrealized gains (losses) during the period	$ (765)	$ 167	$ (1,061)	$ 706
Reclassification adjustment included in net income	4	8	(5)	89
Other comprehensive income (loss)	(761)	175	(1,066)	795
AOCI
Pretax
Other comprehensive income (loss)	(994)	227	(1,394)	1,038
Tax (expense) benefit
Other comprehensive income (loss)	233	(52)	328	(243)
After-tax
Other comprehensive income (loss)	(761)	175	(1,066)	795
Unrealized gains and (losses) on debt securities
Pretax
Unrealized gains (losses) during the period	(681)	197	(806)	591
Reclassification adjustment included in net income	2	2	(20)	69
Tax (expense) benefit
Unrealized gains (losses) during the period	159	(46)	189	(139)
Reclassification adjustment included in net income	0	0	5	(16)
After-tax
Unrealized gains (losses) during the period	(522)	151	(617)	452
Reclassification adjustment included in net income	2	2	(15)	53
Other comprehensive income (loss)	(520)	153	(632)	505
Net change related to cash flow hedges on loans
Pretax
Unrealized gains (losses) during the period	(320)	23	(584)	324
Reclassification adjustment included in net income	3	7	13	46
Tax (expense) benefit
Unrealized gains (losses) during the period	75	(6)	137	(77)
Reclassification adjustment included in net income	(1)	(1)	(3)	(10)
After-tax
Unrealized gains (losses) during the period	(245)	17	(447)	247
Reclassification adjustment included in net income	2	6	10	36
Other comprehensive income (loss)	(243)	23	(437)	283
Net change related to cash flow hedges on loans \| Cash Flow Hedges
Pretax
Other comprehensive income (loss)	(317)	30	(571)	370
Tax (expense) benefit
Other comprehensive income (loss)	74	(7)	134	(87)
After-tax
Other comprehensive income (loss)	(243)	23	(437)	283
Translation adjustments, net of hedges
Pretax
Unrealized gains (losses) during the period				7
Other comprehensive income (loss)		(2)	(3)
Tax (expense) benefit
Unrealized gains (losses) during the period				(1)
Other comprehensive income (loss)		1	2
After-tax
Unrealized gains (losses) during the period	0	(1)	(1)	6
Reclassification adjustment included in net income	0	0	0	0
Other comprehensive income (loss)	0	(1)	(1)	6
Unrealized losses for pension and other post-retirement obligations
Pretax
Other comprehensive income (loss)	2		6	1
Tax (expense) benefit
Other comprehensive income (loss)	0		(2)	0
After-tax
Unrealized gains (losses) during the period	2	0	4	1
Reclassification adjustment included in net income	0	0	0	0
Other comprehensive income (loss)	2	0	4	1
Debt securities \| Unrealized gains and (losses) on debt securities
Pretax
Other comprehensive income (loss)	(679)	199	(826)	660
Tax (expense) benefit
Other comprehensive income (loss)	159	(46)	194	(155)
After-tax
Other comprehensive income (loss)	$ (520)	$ 153	$ (632)	$ 505

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-URI https://asc.fasb.org/1943274/2147482765/220-10-50-4

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 55
-Paragraph 15
-SubTopic 10
-Topic 220
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482739/220-10-55-15

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