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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME        
Net income $ 244 $ 330 $ 587 $ 209
Net income attributable to noncontrolling interest 15 9 32 29
Net income attributable to controlling interest 229 321 555 180
Components of net periodic benefit costs before reclassifications 8 33 1 19
Components of net periodic benefit costs reclassified to net income 8 9 9 19
Other comprehensive income before income taxes 16 42 10 38
Income taxes related to other comprehensive income     (3) (2)
Other comprehensive income 16 42 7 36
Other comprehensive income attributable to controlling interest 16 42 7 36
Total comprehensive income 260 372 594 245
Total comprehensive income attributable to noncontrolling interest 15 9 32 29
Total comprehensive income attributable to controlling interest $ 245 $ 363 $ 562 $ 216