XML 150 R131.htm IDEA: XBRL DOCUMENT v3.10.0.1
Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive loss $ (16) $ (14) $ 0
Other Comprehensive Income (Loss), Net of Tax (2) (14)  
Pension Plan [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive loss (14) (13) 0
Other Comprehensive Income (Loss), Net of Tax (1) (13)  
Other Postretirement Benefits Plan [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive loss (2) (1) $ 0
Other Comprehensive Income (Loss), Net of Tax $ (1) $ (1)