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Revenue Contract Balances (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]      
Contract with Customer, Liability $ 121 $ 131  
Contract with Customer, Liability, Revenue Recognized 29    
Loan receivable $ 1,458 $ 1,490 $ 0