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Debt (Pledged Assets Related to Secured Borrowings and Repurchase Agreement) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Pledged Assets related to secured borrowings [Line Items] |  |
Total assets restricted as collateral | $ 67,458 | $ 69,512
Secured debt | 6,449 | 10,443
Amortized cost | 28,114 | 28,416
Short-term borrowings | 0 | 3,297
Asset Pledged as Collateral |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Amortized cost | 3,017 | 4,030
Pledged assets for Federal Home Loan Bank |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Total assets restricted as collateral | 27,600 | 27,900
Pledged assets for Federal Reserve Bank |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Total assets restricted as collateral | 33,900 | 34,000
Investment securities |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Total assets restricted as collateral | 3,165 | 4,036
Consumer | Automotive |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Total assets restricted as collateral | 39,815 | 40,805
Consumer | Consumer mortgage |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Total assets restricted as collateral | 18,478 | 18,703
Commercial |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Total assets restricted as collateral | $ 6,000 | $ 5,968

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