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Accounting Policies - Components of Other Income, Net (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Other income, net $ (25) $ (27) $ (28)
Accounting Standards Update 2017-07      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Other components of net periodic benefit cost (30) (27) (28)
Net loss from investments 5 0 0
Other income, net $ (25) $ (27) $ (28)