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Accounting Changes - Revenue Recognition (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Accounting Changes      
Capitalized in-scope sales commission costs $ 5,006    
Deferred tax assets 5,111   $ 4,862
Retained earnings $ 156,371   $ 153,126
Accounting Standards Update 2014-09, Revenue from Contracts with Customers | Adjustments for adoption of guidance      
Accounting Changes      
Net contract assets   $ 557  
Capitalized in-scope sales commission costs   737  
Deferred income   29  
Deferred tax assets   (184)  
Retained earnings   $ 524