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Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($) $ in Millions | Jan. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
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New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |
Retained earnings |  |  | $ 40,636 |  | $ 39,115
ASU 2016-16 Intra-Entity Transfers of Assets Other Than Inventory | Maximum |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |
Retained earnings |  |  |  | $ (2) |
ASU 2018-02 Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income | Forecast |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  | $ 900 |  |  |
ASU 2016-02 Leases | Forecast |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |
Lease assets | $ 800 |  |  |  |
Lease liabilities | $ 800 |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Maximum |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |
Retained earnings |  |  |  | $ 2 |

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