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Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($) $ in Millions | Jan. 01, 2019 | Mar. 31, 2019 | Jan. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
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New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |
Stockholders' equity |  | $ 9,703 |  | $ 9,796 |  |
Retained earnings |  | 41,159 |  | 40,636 |  |
Lease assets |  | 797 |  |  |  |
Lease liabilities |  | 786 |  |  |  |
ASU 2016-02 Leases |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  | 14 |  |  |  |
ASU 2016-02 Leases | Adjustment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |
Lease assets | $ 800 |  | $ 800 |  |  |
Lease liabilities | 800 |  |  |  |  |
Retained Earnings | ASU 2018-02 Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |
Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings, Tax Effect | 900 |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  | 853 |  |  |  |
Retained Earnings | ASU 2016-02 Leases |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  | 14 |  |  |  |
Retained Earnings | ASU 2016-02 Leases | Adjustment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |
Stockholders' equity | 14 |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |
Stockholders' equity |  | (7,552) |  | $ (6,866) | $ (6,803) | $ (7,026)
Accumulated Other Comprehensive Income (Loss) | ASU 2018-02 Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |
Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings, Tax Effect | $ 900 |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  | (853) |  |  |  |
Accumulated Other Comprehensive Income (Loss) | ASU 2016-02 Leases |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  | $ (853) |  |  |  |

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