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New Accounting Standards Recently Adopted Accounting Pronouncements (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Oct. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating Lease, Right-of-Use Asset $ 1,088  
Operating lease liability $ 1,093  
Accounting Standards Update 2016-02 [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating Lease, Right-of-Use Asset   $ 1,100
Operating lease liability   $ 1,100