Other Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013
Other Income Details [Abstract]
Rental income	$ 23	$ 21	$ 47		$ 58	[1]
Net gain on non-operating asset dispositions	7	0	11		4
Interest Income	1	1	2		2
Non-operating environmental costs and other	(9)	1	0	[2]	(1)
Total	22	23	60		63
Land lease contract settlement					17
Permanent easement sale			$ 14

[1] Rental income includes $17 million related to a land lease contract settlement.

[2] Non-operating environmental costs and other includes $14 million related to the sale of a permanent easement.