Income Taxes (Tax Carryforwards) (Details) $ in Millions	Dec. 31, 2021 USD ($)
Tax Credit Carryforward [Line Items]
Tax Credit Carryforwards	$ 1,088
Tax Loss Carryforwards	1,820
Expiration Period Current To Five Years [Member]
Tax Credit Carryforward [Line Items]
Tax Credit Carryforwards	65
Tax Loss Carryforwards	364
Expiration Period Six To Ten Years [Member]
Tax Credit Carryforward [Line Items]
Tax Credit Carryforwards	115
Tax Loss Carryforwards	141
Expiration Period Eleven To Twenty Years [Member]
Tax Credit Carryforward [Line Items]
Tax Credit Carryforwards	391
Tax Loss Carryforwards	257
Expiration Period Indefinite [Member]
Tax Credit Carryforward [Line Items]
Tax Credit Carryforwards	517
Tax Loss Carryforwards	$ 1,058