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Other Income, Net (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Component of Other Income, Nonoperating [Line Items]      
Gains/(Losses) on derivatives $ (165) $ 11 $ 575
Currency revaluation gains/(losses) 12 44 (575)
Interest and investment income 198 112 85
Insurance fee income 0 0 90
Other 35 83 155
Total other income, net 80 250 330
Affiliated Entity [Member]      
Component of Other Income, Nonoperating [Line Items]      
Related Party Transaction, Interest Income, Notes Receivable, Tax Sharing Agreement $ 10 $ 9 $ 5