Income Taxes (Tax Carryforwards) (Details) $ in Millions	Dec. 31, 2023 USD ($)
Tax Credit Carryforward [Line Items]
Tax Credit Carryforwards	$ 891
Tax Loss Carryforwards	4,601
Expiration Period Current To Five Years [Member]
Tax Credit Carryforward [Line Items]
Tax Credit Carryforwards	56
Tax Loss Carryforwards	317
Expiration Period Six To Ten Years [Member]
Tax Credit Carryforward [Line Items]
Tax Credit Carryforwards	36
Tax Loss Carryforwards	180
Expiration Period Eleven To Twenty Years [Member]
Tax Credit Carryforward [Line Items]
Tax Credit Carryforwards	299
Tax Loss Carryforwards	832
Expiration Period Indefinite [Member]
Tax Credit Carryforward [Line Items]
Tax Credit Carryforwards	500
Tax Loss Carryforwards	$ 3,272