XML 136 R91.htm IDEA: XBRL DOCUMENT v3.8.0.1
Income Taxes - Provision for income taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Federal $ (9) $ 134 $ 172
State 3 3 8
Foreign 0 (6) 6
Total current (6) 131 186
Deferred:      
Federal (85) 19 (10)
State (9) 2 4
Foreign 0 1 (1)
Total deferred (94) 22 (7)
Total provision for income taxes $ (100) $ 153 $ 179