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New Accounting Guidance - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 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 [Line Items] |  |  |  |  |
Operating lease, liability | $ 2,328 |  |  |  |
Operating lease, right-of-use asset | 2,016 |  | $ 0 |  |
Retained earnings | $ 14,741 |  | 14,347 |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | $ (14)
Retained Earnings |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  | $ 14 |  |
Accounting Standards Update 2016-02 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating lease, liability |  | $ 1,900 |  |  |
Operating lease, right-of-use asset |  | 1,700 |  |  |
Accounting Standards Update 2014-09 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Retained earnings |  |  |  | $ 364 |
Accounting Standards Update 2016-16 | Retained Earnings |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  | $ (14) |
Real Estate | Accounting Standards Update 2016-02 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating lease, right-of-use asset |  | 1,700 |  |  |
Restatement Adjustment | Accounting Standards Update 2016-02 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Other liabilities |  | $ 200 |  |  |

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