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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition          
Retained earnings $ 42,085   $ 42,085   $ 40,636
Contract Balance          
Current deferred income balances 605   $ 605   $ 617
Software license contracts term     1 year    
Net Sales 7,991 $ 8,152 $ 24,025 $ 24,820  
ASU 2014-09 Revenue from Contracts with Customers          
Contract Balance          
Net Sales $ 80 $ 70 $ 560 $ 460