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Debt - Schedule of Pledged Assets Related to Secured Borrowings and Repurchase Agreement (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Pledged Assets related to secured borrowings [Line Items] |  |
Total assets restricted as collateral | $ 64,024 | $ 65,497
Secured debt | 9,546 | 8,058
Amortized cost | 25,660 | 26,810
Short-term borrowings | 3,879 | 1,625
Secured debt |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Short-term borrowings | 3,879 | 1,625
Asset Pledged as Collateral |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Amortized cost | 3,136 | 2,822
Credit-Linked Notes |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Total assets restricted as collateral | 980 | 669
Pledged assets for Federal Home Loan Bank |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Total assets restricted as collateral | 26,100 | 26,500
Pledged assets for Federal Reserve Bank |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Total assets restricted as collateral | 33,700 | 33,800
Investment securities |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Total assets restricted as collateral | 3,326 | 2,946
Consumer | Automotive |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Total assets restricted as collateral | 36,396 | 38,316
Consumer | Consumer mortgage finance receivables |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Total assets restricted as collateral | 16,288 | 17,269
Commercial |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Total assets restricted as collateral | $ 7,034 | $ 6,297

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