Indebtedness - Summary of Unsecured Senior Notes (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Unsecured senior notes, net	$ 2,670,000,000	$ 2,074,000,000
Unsecured Senior Notes
Debt Instrument [Line Items]
Unsecured senior notes principal amount	2,700,000,000	2,100,000,000
Unamortized debt issuance costs and discount, net of premium	(30,000,000)	(26,000,000)
Unsecured senior notes, net	2,670,000,000	2,074,000,000
Unsecured Senior Notes | $850 Face Value, 5.500% interest payable semi-annually, due August 2028
Debt Instrument [Line Items]
Unsecured senior notes principal amount	850,000,000	850,000,000
Face amount	$ 850,000,000
Interest rate	5.50%
Unsecured Senior Notes | $600 face value, 6.000% interest rate payable semi-annually, due January 2027
Debt Instrument [Line Items]
Unsecured senior notes principal amount	$ 600,000,000	600,000,000
Face amount	$ 600,000,000
Interest rate	6.00%
Unsecured Senior Notes | $600 face value, 6.500% interest rate payable semi-annually, due July 2021
Debt Instrument [Line Items]
Unsecured senior notes principal amount	$ 600,000,000	0
Face amount	$ 600,000,000
Interest rate	5.75%
Unsecured Senior Notes | Unsecured Senior Notes, 5.125% Due December 2030
Debt Instrument [Line Items]
Unsecured senior notes principal amount	$ 650,000,000	$ 650,000,000
Face amount	$ 650,000,000
Interest rate	5.125%