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Investments - Schedule of Equity Method Investments - Income Statement (Details) (Details) - Ceridian - USD ($)
$ in Millions
12 Months Ended 15 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]    
Total revenues $ 773 $ 1,042
Loss before income taxes (53) (76)
Gain on sale of Comdata 0 1,526
Net (loss) earnings $ (88) $ 1,354