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Lease Commitments (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Leases [Abstract]      
Operating leases, minimum annual rentals in 2019 $ 54    
Operating leases, minimum annual rentals in 2020 42    
Operating leases, minimum annual rentals in 2021 34    
Operating leases, minimum annual rentals in 2022 26    
Operating leases, minimum annual rentals in 2023 21    
Operating leases, minimum annual rentals, thereafter 117    
Rental expense (net of sublease rental income) $ 50 $ 50 $ 53