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Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accounting Standards Update 2018-11 |  |  |  |  |
Right-of-use asset | $ 350 |  |  |  |
Operating lease, liability | $ 350 |  |  |  |
Retained Earnings |  |  |  |  |
Cumulative-effect adjustment on retained earnings |  |  | $ (759) | $ 0 | $ 0
Retained Earnings | Accounting Standards Update 2016-16 |  |  |  |  |
Cumulative-effect adjustment on retained earnings |  | $ (695) |  |  |
Employee Stock Option |  |  |  |  |
Vesting period | 10 years |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Performance period | 3 years |  |  |  |
Performance Stock Units (PSUs) |  |  |  |  |
Vesting period | 3 years |  |  |  |
Minimum |  |  |  |  |
Finite-lived intangible asset, useful life | 4 years |  |  |  |
Maximum |  |  |  |  |
Finite-lived intangible asset, useful life | 40 years |  |  |  |
Building and Improvements | Minimum |  |  |  |  |
Property, plant and equipment useful life | 3 years |  |  |  |
Building and Improvements | Maximum |  |  |  |  |
Property, plant and equipment useful life | 30 years |  |  |  |
Machinery and Equipment | Minimum |  |  |  |  |
Property, plant and equipment useful life | 3 years |  |  |  |
Machinery and Equipment | Maximum |  |  |  |  |
Property, plant and equipment useful life | 10 years |  |  |  |

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