Debt (Components of Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Feb. 26, 2023	Dec. 31, 2022	Sep. 30, 2022	May 31, 2022	Jan. 06, 2022	Apr. 07, 2020	Jul. 31, 2018	Jan. 31, 2015
Debt Instrument [Line Items]
Total debt	$ 4,131		$ 4,414
Unamortized Issuance Expense	(36)		(44)
Unamortized Debt Premium/Discount	19		22
Total long-term debt	4,114		4,392
Total debt	$ 4,114		$ 4,392
Line of Credit | 2022 Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility, variable interest rate	7.16%		6.15%
Line of Credit | 2022 Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Debt Instrument	$ 388		$ 250
Unamortized Issuance Expense	0		0
Unamortized Debt Premium/Discount	0		0
Total long-term debt	388		250
Senior Notes | 4.95% Senior Notes due January 2025
Debt Instrument [Line Items]
Debt Instrument	389		389
Unamortized Issuance Expense	(1)		(1)
Unamortized Debt Premium/Discount	0		0
Total long-term debt	$ 388		$ 388
Stated interest rate	4.95%		4.95%		5.70%	5.95%	6.45%	6.20%	4.95%
Senior Notes | 7.75% Senior Notes due October 2027
Debt Instrument [Line Items]
Debt Instrument			$ 421
Unamortized Issuance Expense			(3)
Unamortized Debt Premium/Discount			0
Total long-term debt			$ 418
Stated interest rate		7.75%	7.75%	7.75%
Senior Notes | 8.375% Senior Notes due September 2028
Debt Instrument [Line Items]
Debt Instrument	$ 304		$ 304
Unamortized Issuance Expense	(3)		(3)
Unamortized Debt Premium/Discount	0		0
Total long-term debt	$ 301		$ 301
Stated interest rate	8.375%		8.375%	8.375%
Senior Notes | 5.375% Senior Notes due February 2029
Debt Instrument [Line Items]
Debt Instrument	$ 700		$ 700
Unamortized Issuance Expense	(5)		(5)
Unamortized Debt Premium/Discount	19		22
Total long-term debt	$ 714		$ 717
Stated interest rate	5.375%		5.375%
Senior Notes | 5.375% Senior Notes due March 2030
Debt Instrument [Line Items]
Debt Instrument	$ 1,200		$ 1,200
Unamortized Issuance Expense	(13)		(16)
Unamortized Debt Premium/Discount	0		0
Total long-term debt	$ 1,187		$ 1,184
Stated interest rate	5.375%		5.375%
Senior Notes | 4.75% Senior Notes due February 2032
Debt Instrument [Line Items]
Debt Instrument	$ 1,150		$ 1,150
Unamortized Issuance Expense	(14)		(16)
Unamortized Debt Premium/Discount	0		0
Total long-term debt	$ 1,136		$ 1,134
Stated interest rate	4.75%		4.75%
Other long-term assets | Line of Credit | 2022 Revolving Credit Facility
Debt Instrument [Line Items]
Unamortized Issuance Expense	$ (16)		$ (19)