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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 |

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