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Debt - Schedule of Pledged Assets Related to Secured Borrowings and Repurchase Agreement (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Pledged Assets related to secured borrowings [Line Items] |  |
Total assets restricted as collateral | $ 65,721 | $ 65,497
Secured debt | 9,226 | 8,058
Amortized cost | 25,772 | 26,810
Short-term borrowings | 3,339 | 1,625
Asset Pledged as Collateral |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Amortized cost | 3,657 | 2,822
Credit-Linked Notes |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Total assets restricted as collateral | 599 | 669
Pledged assets for Federal Home Loan Bank |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Total assets restricted as collateral | 26,700 | 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 | 3,810 | 2,946
Consumer | Automotive |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Total assets restricted as collateral | 37,560 | 38,316
Consumer | Consumer mortgage finance receivables |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Total assets restricted as collateral | 16,997 | 17,269
Commercial |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Total assets restricted as collateral | $ 6,755 | $ 6,297

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- Definition Amortized cost excluding accrued interest, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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