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Fair Value Measurements (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Carrying value |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Total debt | $ 20,400 | $ 19,900 |
Level 2 | Fair Value |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Total debt | 21,800 | 22,500 |
Fair Value, Inputs, Level 3 |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Contingent liability | 4 | 8 |
Lending Solutions Business |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Other (expense) income | 12 | 13 | $ 7
Financial Guarantee | Lending Solutions Business |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Contingent debt guarantee | $ 10 | $ 18 |

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