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Accumulated Other Comprehensive Loss - Schedule of Reclassification Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss), before tax | $ 868 | $ (226)
Other comprehensive income (loss), tax effect | (206) | 53
Other comprehensive (loss) income, net of tax | 662 | (173)
Available-for-sale securities |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Net unrealized gains (losses) arising during the period, before tax | 346 | (223)
Net unrealized gains (losses) arising during the period, tax | (81) | 53
Net unrealized gains (losses) arising during the period, net of tax | 265 | (170)
Reclassification from AOCI, before tax | (495) | 1
Reclassification from AOCI, tax | 118 | 0
Reclassification from AOCI, net of tax | (377) | 1
Other comprehensive income (loss), before tax | 841 | (224)
Other comprehensive income (loss), tax effect | (199) | 53
Other comprehensive (loss) income, net of tax | 642 | (171)
Held-to-maturity securities |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Reclassification from AOCI, before tax | (20) | (20)
Reclassification from AOCI, tax | 5 | 5
Reclassification from AOCI, net of tax | (15) | (15)
Other comprehensive (loss) income, net of tax | 15 | 15
Translation adjustments |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss), before tax |  | (5)
Other comprehensive income (loss), tax effect |  | 1
Other comprehensive (loss) income, net of tax |  | (4)
Net investment hedges |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss), before tax |  | 4
Other comprehensive income (loss), tax effect |  | (1)
Other comprehensive (loss) income, net of tax |  | 3
Cash flow hedges |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Net unrealized gains (losses) arising during the period, before tax |  | (22)
Net unrealized gains (losses) arising during the period, tax |  | 5
Net unrealized gains (losses) arising during the period, net of tax |  | (17)
Reclassification from AOCI, before tax | (7) | (1)
Reclassification from AOCI, tax | 2 | 0
Reclassification from AOCI, net of tax | (5) | (1)
Other comprehensive income (loss), before tax | 7 | (21)
Other comprehensive income (loss), tax effect | (2) | 5
Other comprehensive (loss) income, net of tax | $ 5 | $ (16)

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