Income Tax (Net Operating Carryforwards for Tax Purposes) (Details) $ in Millions	Dec. 31, 2018 USD ($)
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	$ 7
Domestic Tax Authority | 2019-2023
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	1
Domestic Tax Authority | 2024-2028
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	0
Domestic Tax Authority | 2029-2033
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	6
Domestic Tax Authority | 2034-2038
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	0
Domestic Tax Authority | Indefinite
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	0
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	140
State and Local Jurisdiction | 2019-2023
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	0
State and Local Jurisdiction | 2024-2028
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	0
State and Local Jurisdiction | 2029-2033
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	0
State and Local Jurisdiction | 2034-2038
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	140
State and Local Jurisdiction | Indefinite
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	0
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	501
Foreign Tax Authority | 2019-2023
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	67
Foreign Tax Authority | 2024-2028
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	18
Foreign Tax Authority | 2029-2033
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	0
Foreign Tax Authority | 2034-2038
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	0
Foreign Tax Authority | Indefinite
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	$ 416