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Leases (Other Information) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Leases [Abstract]    
Operating cash flows from operating leases $ 313 $ 315
Operating cash flows from finance leases 25 30
Financing cash flows from finance leases 102 102
Leased assets obtained in exchange for new operating lease liabilities $ 54 $ 62