Summary of Significant Accounting Policies - Recent Accounting Developments (Details) - USD ($) $ in Millions	Jan. 01, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity		$ 3,600	$ 1,680	$ 1,658	$ (1,234)
Deferred tax liabilities		(1,090)	(224)
Cumulative Effect, Period of Adoption, Adjustment | Subsequent Event
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt Instrument, Unamortized Discount	$ 57
Deferred tax liabilities	14
Additional Paid-In Capital
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity		8,531	8,517	8,501	8,510
Additional Paid-In Capital | Cumulative Effect, Period of Adoption, Adjustment | Subsequent Event
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity	(100)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity		$ 464	$ (1,403)	$ (1,616)	$ (6,022)
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment | Subsequent Event
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity	$ 57