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Discontinued Operations - Textuals (Details) - USD ($)
$ in Millions
2 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]                
Cash consideration for discontinued operations $ 675 $ 675       $ 675    
Gain on sale of discontinued operations, net of tax   $ 279 $ 0 $ 0 $ 0 279 $ 0 $ 0
Sales to discontinued operations previously eliminated in consolidation           $ 568 $ 531 $ 532
Cash inflow from discontinued operations $ 102