Goodwill and Intangible Assets Amortization of Intangible Assets (Details) - USD ($) $ in Millions	1 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 13, 2019	Dec. 31, 2020	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months			$ 157
Finite-Lived Intangible Assets, Amortization Expense, Year Two			157
Finite-Lived Intangible Assets, Amortization Expense, Year Three			157
Finite-Lived Intangible Assets, Amortization Expense, Year Four			144
Finite-Lived Intangible Assets, Amortization Expense, Year Five			40
Amortization of Intangible Assets	$ 9	$ 61	$ 163	$ 63