XML 78 R67.htm IDEA: XBRL DOCUMENT v3.10.0.1
Pension Benefits Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Retirement Benefits [Abstract]    
Defined Benefit Pension Plan, Postemployment Benefit Period 5 years  
Liability, Other Retirement Benefits $ 4 $ 4