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Finance Receivables and Loans, Net (Allowance for Credit Losses on Financing Receivables) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowance, beginning balance | $ 3,587 | $ 3,711 | $ 3,711 |
Charge-offs | (758) | (601) | (2,720) |
Recoveries | 219 | 192 |  |
Net charge-offs | (539) | (409) |  |
Write-downs from transfers to held-for-sale | (5) |  |  |
Provision for credit losses | 507 | 449 |  |
Other |  | 0 |  |
Allowance, ending balance | 3,550 | 3,751 | 3,587 |
Unfunded Loan Commitment |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |
Provision for credit losses |  | (3) |  |
Consumer |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |
Charge-offs | (757) |  | (2,590) |
Consumer | Automotive |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowance, beginning balance | 3,083 | 3,020 | 3,020 |
Charge-offs | (688) | (536) | (2,284) |
Recoveries | 211 | 185 |  |
Net charge-offs | (477) | (351) |  |
Write-downs from transfers to held-for-sale | (5) |  | (41) |
Provision for credit losses | 449 | 353 |  |
Other |  | 0 |  |
Allowance, ending balance | 3,050 | 3,022 | 3,083 |
Consumer | Consumer mortgage |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowance, beginning balance | 21 | 27 | 27 |
Charge-offs | (1) | (1) | (3) |
Recoveries | 1 | 2 |  |
Net charge-offs | 0 | 1 |  |
Write-downs from transfers to held-for-sale | 0 |  |  |
Provision for credit losses | 0 | (4) |  |
Other |  | (1) |  |
Allowance, ending balance | 21 | 23 | 21 |
Consumer | Consumer other |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowance, beginning balance | 293 | 426 | 426 |
Charge-offs | (68) | (64) | (303) |
Recoveries | 6 | 5 |  |
Net charge-offs | (62) | (59) |  |
Write-downs from transfers to held-for-sale | 0 |  | (174) |
Provision for credit losses | 60 | 88 |  |
Other |  | 0 |  |
Allowance, ending balance | 291 | 455 | 293 |
Fair value, option, carrying amount, financing receivable, no allowance |  | 2 |  | $ 3
Commercial |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowance, beginning balance | 190 | 238 | 238 |
Charge-offs | (1) | 0 | (130) |
Recoveries | 1 | 0 |  |
Net charge-offs | 0 | 0 |  |
Write-downs from transfers to held-for-sale | 0 |  |  |
Provision for credit losses | (2) | 12 |  |
Other |  | 1 |  |
Allowance, ending balance | 188 | $ 251 | 190 |
Commercial | Automotive |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |
Charge-offs | $ (1) |  | (24) |
Commercial | Consumer other |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |
Charge-offs |  |  | $ (106) |

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