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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 20, 2018
Income Tax Disclosures [Line Items]      
One-time Transition Tax Rate $ (115) $ (231)  
Gain (Loss) on Disposition of Business $ 4 $ (788)  
Effective Income Tax Rate Reconciliation, Percent 32.00% 23.00%  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%    
Proceeds from Divestiture of Businesses and Interests in Affiliates $ 0 $ 1,180  
Masinloc Subsidiary [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]      
Income Tax Disclosures [Line Items]      
Gain (Loss) on Disposition of Business   777  
Tax on gain (loss) on disposition of business   155  
Proceeds from Divestiture of Businesses and Interests in Affiliates   $ 1,050  
Masinloc Subsidiary [Member]      
Income Tax Disclosures [Line Items]      
Disposal Group Not Discontinued Operation Ownership Interest Sold     51.00%
Change in Accounting Estimate, Type [Domain] | UNITED STATES      
Income Tax Disclosures [Line Items]      
One-time Transition Tax Rate $ (3)