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Leases (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Leases [Abstract]          
Operating Lease, Right-of-Use Asset   $ 833   $ 833 $ 912
Operating Lease, Liability, Current   (113)   (113) (128)
Operating Lease, Liability, Noncurrent   782   782 690
Finance Lease, Liability   65   65 $ 89
Proceeds from Sale Leaseback Transactions $ 59 $ 327 $ 118 $ 445