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Leases (Other Information) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Leases [Abstract]    
Operating cash flows from operating leases $ 252 $ 255
Operating cash flows from finance leases 15 20
Financing cash flows from finance leases 66 79
Leased assets obtained in exchange for new operating lease liabilities $ 50 $ 27