Income Taxes - Tax Carryforwards and Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Operating Loss and Tax Credit Carryforwards [Line Items]
Net operating loss carryforwards	$ 346	$ 330
Tax credit carryforwards	4,905	$ 4,646
Federal [Member]
Operating Loss and Tax Credit Carryforwards [Line Items]
Net operating loss carryforwards	11
Tax credit carryforwards	4,555
Net operating loss carryforwards with indefinite expiration period	9
State [Member]
Operating Loss and Tax Credit Carryforwards [Line Items]
Net operating loss carryforwards	315
Tax credit carryforwards	345
Tax credit carryforward with indefinite expiration period	191
Foreign [Member]
Operating Loss and Tax Credit Carryforwards [Line Items]
Net operating loss carryforwards	20
Tax credit carryforwards	5
Net operating loss carryforwards with indefinite expiration period	$ 1