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Revenue (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition |  |  |
Retained earnings | $ 38,453 |  | $ 39,115
Contract Balance |  |  |
Current deferred income balances | 519 |  | $ 513
Net Sales | $ 8,278 |  |
Exemptions and Practical Expedients Applied or Elected |  |  |
Practical Expedient, unfulfilled performance obligation | true |  |
Practical Expedient, relative to costs of obtaining a contract | true |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Maximum |  |  |
Revenue, Initial Application Period Cumulative Effect Transition |  |  |
Retained earnings |  | $ 2 |
ASU 2014-09 Revenue from Contracts with Customers | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |
Contract Balance |  |  |
Net Sales | $ 280 |  |

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