Debt - Narrative (Details) - USD ($)	1 Months Ended		3 Months Ended	6 Months Ended
	Mar. 31, 2025	Jan. 31, 2025	Jun. 30, 2025	Jun. 30, 2025	Dec. 31, 2024
Secured Debt
Debt Instrument [Line Items]
Outstanding borrowings			$ 0	$ 0
Credit Facility | Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			2,500,000,000	2,500,000,000
Unused borrowing capacity			$ 2,500,000,000	$ 2,500,000,000
Credit spread adjustment				0.10%
Credit Facility | Credit Facility | Federal Funds Effective Rate
Debt Instrument [Line Items]
Variable rate percentage				0.50%
Credit Facility | Credit Facility | SOFR
Debt Instrument [Line Items]
Variable rate percentage				1.00%
Credit Facility | Credit Facility | Maximum
Debt Instrument [Line Items]
Ratio of indebtedness to net capital			0.65	0.65
Variable rate percentage				1.875%
Unused capacity, commitment fee percentage				0.275%
Credit Facility | Credit Facility | Maximum | S O F R One Month Period Additional Applicable Margin
Debt Instrument [Line Items]
Variable rate percentage				0.875%
Credit Facility | Credit Facility | Minimum
Debt Instrument [Line Items]
Variable rate percentage				1.25%
Unused capacity, commitment fee percentage				0.15%
Credit Facility | Credit Facility | Minimum | S O F R One Month Period Additional Applicable Margin
Debt Instrument [Line Items]
Variable rate percentage				0.25%
Credit Facility | Credit Facility | Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 500,000,000	$ 500,000,000
Credit Facility | Credit Facility | Swingline Loans
Debt Instrument [Line Items]
Maximum borrowing capacity			50,000,000	50,000,000
4.95% senior notes due 2025 | Senior Notes
Debt Instrument [Line Items]
Outstanding borrowings			$ 0	$ 0	$ 389,000,000
Extinguishment of debt		$ 389,000,000
Interest rate, stated percentage		4.95%	4.95%	4.95%
5.50% senior notes due 2026 | Senior Notes
Debt Instrument [Line Items]
Outstanding borrowings			$ 0	$ 0	47,000,000
Extinguishment of debt	$ 47,000,000
Interest rate, stated percentage	5.50%		5.50%	5.50%
5.375% senior notes due 2029 | Senior Notes
Debt Instrument [Line Items]
Outstanding borrowings			$ 700,000,000	$ 700,000,000	700,000,000
Interest rate, stated percentage			5.375%	5.375%
5.875% senior notes due 2029 | Senior Notes
Debt Instrument [Line Items]
Outstanding borrowings			$ 469,000,000	$ 469,000,000	500,000,000
Extinguishment of debt			$ 31,000,000
Interest rate, stated percentage			5.875%	5.875%
6.75% senior notes due 2029 | Senior Notes
Debt Instrument [Line Items]
Outstanding borrowings			$ 866,000,000	$ 866,000,000	$ 950,000,000
Extinguishment of debt			$ 84,000,000
Interest rate, stated percentage			6.75%	6.75%