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Supplementary Financial Information (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Other Liabilities Disclosure [Abstract]    
Accrued Liabilities $ 308 $ 307
Estimated Litigation Liability, Current 280 147
Other current liabilities 112 0
Other Sundry Liabilities, Current 117 113
Other current liabilities $ 817 $ 567