Fair Value Measurements - Narrative (Details) - USD ($)	1 Months Ended	12 Months Ended
	Apr. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revolving credit facility | Variable-Rate Revolving Credit Facilities Due March 2023 | 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	$ 75,000,000
Carrying value
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total debt		$ 20,600,000,000	$ 20,400,000,000
Level 2 | Fair Value
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total debt		19,200,000,000	21,800,000,000
Lending Solutions Business
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Other (expense) income		12,000,000	12,000,000	$ 13,000,000
Financial Guarantee
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Carrying value of non-contingent liability		520,000,000
Financial Guarantee | Lending Solutions Business
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Carrying value of non-contingent liability		40,000,000	$ 10,000,000
Financial Guarantee | Lending Joint Ventures | Variable-Rate Revolving Credit Facilities Due March 2023
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Other (expense) income		$ 48,000,000