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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME        
Net Income $ 597 $ 311 $ 1,063 $ 624
Net income (loss) attributable to noncontrolling interest 10 4 20 (4)
Net income attributable to controlling interest 587 307 1,043 628
Other comprehensive income (loss) before reclassifications        
Components of net periodic benefit costs 78 83 73 48
Loss on derivative instruments 0     (5)
Reclassifications to net income        
Components of net periodic benefit costs   13 6 27
(Gain) loss on derivative instruments   11 (2) 18
Other comprehensive income before income taxes 78 107 77 88
Income taxes related to other comprehensive loss (3) (1) (3)  
Other comprehensive income 75 106 74 88
Other comprehensive income attributable to noncontrolling interest       1
Other comprehensive income attributable to controlling interest 75 106 74 87
Total comprehensive income 672 417 1,137 712
Total comprehensive income (loss) attributable to noncontrolling interest 10 4 20 (3)
Total comprehensive income attributable to controlling interest $ 662 $ 413 $ 1,117 $ 715