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Other Assets (Schedule of Other Assets) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Mar. 31, 2024 | Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items] |  |  |
Property and equipment at cost | $ 2,153 | $ 2,160 |
Accumulated depreciation | (871) | (890) |
Net property and equipment | 1,282 | 1,270 |
Proportional amortization investments | 1,866 | 1,877 |
Net deferred tax assets | 1,224 | 1,323 |
Accrued interest, fees, and rent receivables | 935 | 941 |
Nonmarketable equity investments | 886 | 747 |
Goodwill | 669 | 669 | $ 822
Equity-method investments | 651 | 638 |
Restricted cash held for securitization trusts | 407 | 397 |
Other accounts receivable | 189 | 193 |
Operating lease right-of-use assets | 90 | 98 |
Restricted cash and cash equivalents | 87 | 90 |
Net intangible assets | 73 | 67 |
Other assets | 1,036 | 1,038 |
Total other assets | $ 9,395 | $ 9,348 |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Total other assets | Total other assets |
Capitalized software |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Property, plant and equipment, disposals | $ 295 |  |
Disposals, accumulated depreciation | $ 295 |  |

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