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Leases (Cash and Noncash Information of Leases) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Leases [Abstract]    
Cash paid for amounts included in the measurement of lease liabilities $ 42 $ 115
ROU assets obtained in exchange for lease obligations $ 29 $ 83