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General Adoption of New Accounting Pronouncements (Details) - USD ($) $ in Millions | Jan. 01, 2019 | Jun. 30, 2019
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Operating Lease, Right-of-Use Asset |  | $ 601
Operating Lease, Liability |  | $ 642
Accounting Standards Update 2017-08 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative Effect on Retained Earnings, Net of Tax | $ 12 |
Cumulative Effect on Retained Earnings, before Tax | 15 |
Accounting Standards Update 2016-02 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative Effect on Retained Earnings, before Tax | $ 0 |

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