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Basis Of Presentation Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Tax Disclosure [Abstract]        
Income tax expense $ 52 [1] $ 73 [1] $ 33 $ 64
[1] Includes an $8 million expense related to the settlement of the Strader legal matter in Corporate and Other.