Income Taxes Income Taxes - Operating Loss and Tax Credit Carryforwards (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 333	$ 442
Tax Credit Carryforwards	131	55
Total Operating Loss and Tax Credit Carryforwards	464	497
Expiring within Five Years [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	123	99
Tax Credit Carryforwards	14	14
Expiring After Five Years Or Having Indefinite Expiration [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	210	343
Tax Credit Carryforwards	$ 117	$ 41