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Discontinued Operations - Schedule of Results from Discontinued Operations (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]                      
Revenues                 $ 0 $ 1,603 $ 2,196
Loss from discontinued operations                 (10) (24) (321)
Loss on sale                 (113) 0 (6)
Loss from discontinued operations before income tax                 (123) (24) (327)
Income tax (expense) benefit                 (1) (8) 28
Loss from discontinued operations, net of tax $ (7) $ (3) $ (1) $ (113) $ (21) $ 5 $ (6) $ (10) $ (124) $ (32) $ (299)