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Accumulated Other Comprehensive Income - Activity in AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Pretax unrealized losses	$ (69)	$ 459	$ (231)	$ 1,434
Other comprehensive income (loss), tax effect	17	(110)	55	(344)
Other comprehensive (loss) income, net of tax	(52)	349	(176)	1,090
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	34,106	20,403	21,724	19,645
Net Activity	(52)	349	(176)	1,090
Ending Balance	34,482	21,124	34,482	21,124
Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive (loss) income, net of tax	(52)	349	(176)	1,090
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(3,234)	(3,895)	(3,110)	(4,636)
Net Activity	(52)	349	(176)	1,090
Ending Balance	(3,286)	(3,546)	(3,286)	(3,546)
Available-for-sale debt securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income (loss) before reclassifications, pre-tax activity	(97)	237	(227)	870
Other comprehensive income (loss), before reclassifications, tax effect	22	(58)	51	(210)
Other comprehensive income (loss), before reclassifications, net activity	(75)	179	(176)	660
Reclassification adjustment, tax effect	(4)	0	(4)	0
Pretax unrealized losses	(80)	237	(209)	870
Other comprehensive income (loss), tax effect	18	(58)	47	(210)
Other comprehensive (loss) income, net of tax	(62)	179	(162)	660
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(2,331)	(2,799)	(2,231)	(3,280)
Net Activity	(62)	179	(162)	660
Ending Balance	(2,393)	(2,620)	(2,393)	(2,620)
Reclassification adjustment, pre-tax activity	17	0	18	0
Reclassification adjustment, net of tax	13	0	14	0
Available-for-sale debt securities transferred to held-to-maturity securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification adjustment, pre-tax activity	30	28	57	60
Reclassification adjustment, tax effect	(6)	(6)	(11)	(13)
Reclassification adjustment, net activity	24	22	46	47
Pretax unrealized losses	30	28	57	60
Other comprehensive income (loss), tax effect	(6)	(6)	(11)	(13)
Other comprehensive (loss) income, net of tax	24	22	46	47
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(565)	(659)	(587)	(684)
Net Activity	24	22	46	47
Ending Balance	(541)	(637)	(541)	(637)
Cash flow hedge derivatives
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income (loss) before reclassifications, pre-tax activity	(118)	144	(199)	399
Other comprehensive income (loss), before reclassifications, tax effect	28	(34)	47	(96)
Other comprehensive income (loss), before reclassifications, net activity	(90)	110	(152)	303
Reclassification adjustment, pre-tax activity	21	50	42	105
Reclassification adjustment, tax effect	(5)	(12)	(10)	(25)
Reclassification adjustment, net activity	16	38	32	80
Pretax unrealized losses	(97)	194	(157)	504
Other comprehensive income (loss), tax effect	23	(46)	37	(121)
Other comprehensive (loss) income, net of tax	(74)	148	(120)	383
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(321)	(419)	(275)	(654)
Net Activity	(74)	148	(120)	383
Ending Balance	(395)	(271)	(395)	(271)
Net periodic benefit costs
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income (loss) before reclassifications, pre-tax activity	83		83
Other comprehensive income (loss), before reclassifications, tax effect	(19)		(19)
Other comprehensive income (loss), before reclassifications, net activity	64		64
Reclassification adjustment, tax effect	1		1
Pretax unrealized losses	78	0	78	0
Other comprehensive income (loss), tax effect	(18)	0	(18)	0
Other comprehensive (loss) income, net of tax	60	0	60	0
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(15)	(16)	(15)	(16)
Net Activity	60	0	60	0
Ending Balance	45	(16)	45	(16)
Reclassification adjustment, pre-tax activity	(5)		(5)
Reclassification adjustment, net of tax	(4)		(4)
Other
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Pretax unrealized losses	0	0	0	0
Other comprehensive income (loss), tax effect	0	0	0	0
Other comprehensive (loss) income, net of tax	0	0	0	0
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(2)	(2)	(2)	(2)
Net Activity	0	0	0	0
Ending Balance	$ (2)	$ (2)	$ (2)	$ (2)

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