Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Apr. 30, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revolving credit facility | Variable-Rate Revolving Credit Facilities Due April 2027 | Line of Credit | Lending Joint Ventures
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Line of credit facility, borrowing capacity increase	$ 75
Carrying value
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total debt		$ 22,200	$ 20,600
Level 2 | Fair Value
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total debt		21,600	19,200
Lending Solutions Business
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Other (expense) income		7	12	$ 12
Financial Guarantee
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Carrying value of non-contingent liability			520
Financial Guarantee | Lending Solutions Business
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Carrying value of non-contingent liability		$ 31	40
Financial Guarantee | Lending Joint Ventures | Variable-Rate Revolving Credit Facilities Due April 2027
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Other (expense) income			$ 48