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Spin-Off Charges (Reconciliation Of Accrued Spin-off Charges) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Restructuring and Related Cost [Abstract]        
Costs incurred $ 0 $ 0 $ 0 $ 3
Costs paid or otherwise settled     0 (6)
Spin-off [Member]        
Restructuring and Related Cost [Abstract]        
Balance at the beginning of the period     0 1
Costs incurred     1 21 [1]
Costs paid or otherwise settled     (1) (22)
Balance at the end of the period $ 0 0 $ 0 0
Prepaid Spin-off charges   $ 2   $ 2
[1] An additional $2 million of Spin-off charges were pre-paid in 2017 and subsequently expensed during the nine months ended September 30, 2018.