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Leases (Other Information) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Leases [Abstract]    
Operating cash flows from operating leases $ 210 $ 215
Operating cash flows from finance leases 13 17
Financing cash flows from finance leases 41 58
Leased assets obtained in exchange for new operating lease liabilities $ 45 $ 9