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COMBINED AND CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
COMBINED AND CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME        
NET INCOME $ 188 $ 235 $ 657 $ 657
Other comprehensive income (loss) items:        
Unrealized losses on derivatives   (1) [1] (2) [1] (1) [1]
Pension and postretirement gains   1 [2] 1 [2] 3 [2]
Reclassification to income of realized losses (gains) on derivatives     3 [3] (1) [3]
Other comprehensive income, net of tax     2 1
Comprehensive income $ 188 $ 235 $ 659 $ 658
[1] Net of tax of zero for each of the three months ended September 30, 2014 and 2013, and $1 and zero for the nine months ended September 30, 2014 and 2013, respectively.
[2] Net of tax of zero and $(1) for the three months ended September 30, 2014 and 2013, respectively, and zero and $(2) for the nine months ended September 30, 2014 and 2013.
[3] Net of tax of zero for each of the three months ended September 30, 2014 and 2013, and $(2) and $1 for the nine months ended September 30, 2014 and 2013, respectively.