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Leases (Components of Lease Expense) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating lease costs:    
Operating lease cost $ 52 $ 49
Short-term lease cost 5 4
Total operating lease costs 57 53
Finance lease cost:    
Amortization of right-of-use assets 1 1
Total finance lease costs $ 1 $ 1