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Leases (Unaudited) Lease Balance Sheet (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Assets and Liabilities, Lessee [Abstract]    
Operating lease right-of-use assets $ 1,278 $ 0
Operating Lease, Liability, Current 245  
Operating lease liabilities 1,081 $ 0
Operating Lease, Liability $ 1,326