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Leases (Cash and Noncash Information of Leases) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Cash paid for amounts included in the measurement of lease liabilities $ 39 $ 73
ROU assets obtained in exchange for lease obligations $ 46 $ 54