Schedule II - Valuation and Qualifying Accounts and Allowances Footnote to table explanation (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 13, 2019	Dec. 31, 2018
Other Non-current Assets	$ 97	$ 73
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount			$ 0	$ 294
Long [Member] | SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount			$ 0	$ 171