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Leases (Lease Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended 24 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Amortization of leased assets $ 66 $ 72  
Interest on lease liabilities 27 34  
Net lease cost 410 472  
Short-term operating lease cost 26 2  
Variable operating lease cost   12 $ 10
Capitalized in net properties [Member]      
Operating lease cost [1] 30 21  
Equipment and other rents [Member]      
Operating lease cost [1] 247 305  
Purchased services and materials [Member]      
Operating lease cost [1] $ 40 $ 40  
[1] In addition to the lease cost components referenced above, we had short-term lease costs of $26 million and $27 million as of December 31, 2020 and 2019, respectively, and variable lease costs of $10 million and $12 million as of December 31, 2020 and 2019, respectively.