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Basis of Presentation and Summary of Significant Accounting Policies - Contract Assets, Unearned Income and Receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Accounting Policies [Abstract]      
Contract assets $ 177 $ 191 $ 0
Contract with Customer, Asset, Net, Noncurrent 7 2  
Contract with Customer, Liability, Current 112 128  
Contract with Customer, Liability, Noncurrent 32 46 54
Contract with Customer, Asset, Net 40 19  
Accounts Receivable, Net, Current $ 782 $ 908 $ 1,114