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Recent Accounting Pronoucements (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Assets | $ 78,866 | $ 79,055
Liabilities | 43,669 | $ 43,931
Accounting Standards Update 2016-02 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Assets | 500 |
Liabilities | $ 500 |

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