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Recent Accounting Pronoucements (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
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