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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Rent expense table (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Rental expense (1) [1] $ 43 $ 49 $ 117 $ 130
Less: Sublease rental income (11) (7) (28) (19)
Rental expense, net $ 32 $ 42 $ 89 $ 111
[1] Includes contingent rentals totaling $1 million and $3 million for three months ended September 30, 2018 and 2017, respectively and $3 million and $13 million for the nine months ended September 30, 2018 and 2017, respectively.