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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition          
Retained earnings $ 41,362   $ 41,362   $ 40,636
Contract Balance          
Current deferred income balances 603   $ 603   $ 617
Software license contracts term     1 year    
Net Sales 8,171 $ 8,390 $ 16,034 $ 16,668  
ASU 2014-09 Revenue from Contracts with Customers          
Contract Balance          
Net Sales $ 110 $ 110 $ 480 $ 390