Income Taxes - Operating Loss Carryforwards, General Business Credit Carryforwards, and Tax Credit Carryforwards (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
General business credit carryforwards
Net operating loss carryforwards:
General business credit carryforwards	$ 12	$ 41
Federal
Net operating loss carryforwards:
Net operating loss carryforwards	178	443
State
Net operating loss carryforwards:
Net operating loss carryforwards	3,763	3,944
Foreign
Net operating loss carryforwards:
Net operating loss carryforwards	2,580	$ 3,343
Expire 2022 through 2041 | Foreign
Net operating loss carryforwards:
Net operating loss carryforwards	375
Expire 2027 | General business credit carryforwards
Net operating loss carryforwards:
General business credit carryforwards	$ 12