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Borrowings - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 | Feb. 29, 2024 | Oct. 31, 2023 | Jan. 31, 2023 | Jun. 30, 2024 | Dec. 31, 2023
Debt Instrument [Line Items] |  |  |  |  |  |
Short-term borrowings |  |  |  |  | $ 4,764 | $ 5,316
FHLB advances |  |  |  |  | 2,005 | 5
Senior notes |  |  |  |  | 3,743 | 3,741
Asset-backed notes |  |  |  |  | 822 | 474
Long-term borrowings |  |  |  |  | 11,319 | $ 8,201
Secured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Asset-backed notes | $ 526 |  |  |  | 457 |
Long-term debt term (in years) | 2 years |  |  |  |  |
Weighted average interest rate | 5.29% |  |  |  |  |
Secured Debt | Third Party Investors |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Asset-backed notes | $ 511 |  |  |  | 446 |
FHLB of New York |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
FHLB advances |  | $ 2,000 |  |  |  |
Variable interest rate of debt instrument |  | 25.00% |  |  |  |
Available line of credit |  |  |  |  | 15,200 |
FRB of New York |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Available line of credit |  |  |  |  | $ 21,500 |
5.053% Fixed Rate Senior Notes Due to Mature in January 2034 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Variable interest rate of debt instrument | 2.26% |  |  |  |  |
Senior notes | $ 850 |  |  |  |  |
Interest rate of debt instrument | 6.082% |  |  |  |  |
Senior notes maturity date |  |  |  | Jan. 31, 2034 |  |
4.65% Fixed Rate Senior Notes Due to Mature in January 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior notes maturity date |  |  |  | Jan. 31, 2026 |  |
4.70% Fixed Rate Senior Notes Due to Mature in January 2028 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior notes maturity date |  |  |  | Jan. 31, 2028 |  |
7.41% Fixed Rate Senior Notes Due to Mature in October 2029 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior notes maturity date |  |  | Jan. 31, 2034 |  |  |

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