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Taxes - (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Taxes        
Provision for income taxes $ 304 $ 339 $ 138 $ 120
Effective tax rate (as a percent) 10.20% 11.00% 2.00% 1.70%
Unrecognized tax benefits        
Decrease in amount of unrecognized tax benefits     $ 892  
Unrecognized tax benefits $ 6,139   6,139  
Offsetting tax benefits associated with timing adjustments, U.S. tax credits, potential transfer pricing adjustments, and state income taxes 599   599  
Net unrecognized tax benefit amount that, if recognized, would favorably affect the company's effective tax rate 5,540   5,540  
India Tax Authorities        
Taxes        
Prepaid taxes $ 636   $ 636