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Accumulated Other Comprehensive Loss (Reclassification Out of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss), before tax | $ (226) | $ 371
Other comprehensive income (loss), tax effect | 53 | (88)
Other comprehensive income (loss), net of tax | (173) | 283
Available-for-sale securities |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Net unrealized gains (losses) arising during the period, before tax | (223) | 377
Net unrealized gains (losses) arising during the period, tax | 53 | (89)
Net unrealized gains (losses) arising during the period, net of tax | (170) | 288
Reclassification from AOCI, before tax | 1 | 5
Reclassification from AOCI, tax | 0 | (1)
Reclassification from AOCI, net of tax | 1 | 4
Other comprehensive income (loss), before tax | (224) | 372
Other comprehensive income (loss), tax effect | 53 | (88)
Other comprehensive income (loss), net of tax | (171) | 284
Held-to-maturity securities |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Reclassification from AOCI, before tax | (20) |
Reclassification from AOCI, tax | 5 |
Reclassification from AOCI, net of tax | (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 income (loss), 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 income (loss), 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) | 4
Net unrealized gains (losses) arising during the period, tax | 5 | (1)
Net unrealized gains (losses) arising during the period, net of tax | (17) | 3
Reclassification from AOCI, before tax | (1) | 5
Reclassification from AOCI, tax | 0 | (1)
Reclassification from AOCI, net of tax | (1) | 4
Other comprehensive income (loss), before tax | (21) | (1)
Other comprehensive income (loss), tax effect | 5 | 0
Other comprehensive income (loss), net of tax | $ (16) | $ (1)

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