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Other Income (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Other Income [Abstract]          
Rental income $ 26 $ 23   $ 63 $ 48
Net gain on non-operating asset dispositions. [1],[2] 11 63   45 88
Interest Income 4 3   6 5
Non-operating environmental costs and other 2 (12)   (4) (18)
Total $ 43 77   110 $ 123
Real estate sale   $ 50 $ 17 $ 26  
[1] 2016 includes $17 million related to a real estate sale in the first quarter and $50 million related to a real estate sale in the second quarter.
[2] 2017 includes $26 million related to a real estate sale in the first quarter.