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Significant Accounting Policies Significant Accounting Policies (Details) - USD ($) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 01, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2018 | Jan. 01, 2018
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Selling, general and administrative expenses |  | $ 3,941 | $ 3,569 | $ 3,294 |  |
Percent of finished goods at consignment |  | 32.00% | 40.00% |  |  |
Concentration Risk, Customer |  | 0 | 0 | 0 |  |
Other Liabilities, Current |  | $ 800 | $ 412 |  |  |
Other Liabilities, Noncurrent |  | 2,635 | 1,882 |  |  |
Other Assets, Noncurrent |  | 1,529 | 845 |  |  |
Deferred Tax Liabilities, Noncurrent |  | 595 | 328 |  |  |
Shipping and Handling [Member] |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Selling, general and administrative expenses |  | $ 144 | 124 | $ 110 |  |
Adjustments for New Accounting Pronouncement [Member] |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  |  | $ 177
Accounting Standards Update 2016-16 [Member] |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | $ 55 |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Other Liabilities, Current |  |  | 59 |  |  |
Other Liabilities, Noncurrent |  |  | 205 |  |  |
Other Assets, Noncurrent |  |  | 12 |  |  |
Deferred Tax Liabilities, Noncurrent |  |  | $ (41) |  |  |
Operating lease, right-of-use assets, other long-term assets [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 271 |  |  |  |  |
Operating lease, liability, other long-term liabilities [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 278 |  |  |  |  |

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