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Retirement and Deferred Compensation Plans (Fair Value of Benefit Plan Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Fair Value of Benefit Plans' Assets [Abstract]    
Corporate bonds $ 249 $ 292
U.S. government bonds 252 291
Foreign government bonds 216 231
State and municipal bonds 28 32
Common and preferred stock 485 615
Cash and invested cash 125 103
Other investments 65 62
Total $ 1,420 $ 1,626