XML 86 R74.htm IDEA: XBRL DOCUMENT v3.10.0.1
Accumulated Other Comprehensive Income (Loss) - Reclassifications (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]        
Defined Benefit Plans $ 17 $ 26 $ 155 $ 116
Tax expense of defined benefit plans $ 6 $ 14 $ 43 $ 61