Income Taxes - Tax Carryforwards and Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Operating Loss and Tax Credit Carryforwards [Line Items]
Net operating loss carryforwards	$ 262	$ 346
Tax credit carryforwards	3,674	$ 4,905
Federal [Member]
Operating Loss and Tax Credit Carryforwards [Line Items]
Net operating loss carryforwards	1
Tax credit carryforwards	3,324
State [Member]
Operating Loss and Tax Credit Carryforwards [Line Items]
Net operating loss carryforwards	239
Tax credit carryforwards	346
Net operating loss carryforwards with indefinite expiration period	106
Tax credit carryforward with indefinite expiration period	193
Foreign [Member]
Operating Loss and Tax Credit Carryforwards [Line Items]
Net operating loss carryforwards	22
Tax credit carryforwards	4
Net operating loss carryforwards with indefinite expiration period	$ 1