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Revenue Recognition - Impact of Adoption (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Revenue recognition    
Retained earnings $ 22,107 $ 21,935
Accounts receivable, net 5,184 $ 4,145
Topic 606 | Difference between Revenue Guidance in Effect before and after Topic 606    
Revenue recognition    
Retained earnings $ 0