v2.4.0.8
Condensed Consolidating Financial Information (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
Condensed Consolidating Financial Information        
Operating revenues $ 2,328 $ 2,364 $ 4,667 $ 4,548
Cost and expenses 1,564 1,720 3,163 3,421
Loss on impairment   (37) (65) (37)
Gain (loss) on disposal of assets, net 1 (2) (2) (9)
Operating income (loss) 765 605 1,437 1,081
Other income (expense), net        
Interest income (expense), net (97) (135) (213) (275)
Other, net 8 (16) 6 (17)
Total other income (expense), net (89) (151) (207) (292)
Income from continuing operations before income tax expense 676 454 1,230 789
Income tax expense 72 132 152 151
Income from continuing operations 604 322 1,078 638
Gain (loss) from discontinued operations, net of tax (7) (11) (15) (14)
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 income taxes 78 107 77 88
Income taxes related to other comprehensive loss (3) (1) (3)  
Other comprehensive income 75 106 74 88
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
Reportable Entity | Parent Guarantor
        
Condensed Consolidating Financial Information        
Cost and expenses 9 17 18 26
Operating income (loss) (9) (17) (18) (26)
Other income (expense), net        
Interest income (expense), net (16) (3) (10) (6)
Equity in earnings 612 327 1,071 660
Total other income (expense), net 596 324 1,061 654
Income from continuing operations before income tax expense 587 307 1,043 628
Income from continuing operations 587 307 1,043 628
Net Income 587 307 1,043 628
Net income attributable to controlling interest 587 307 1,043 628
Other comprehensive income (loss) before income taxes 14   12 (6)
Other comprehensive income 14   12 (6)
Total comprehensive income 601 307 1,055 622
Total comprehensive income attributable to controlling interest 601 307 1,055 622
Reportable Entity | Subsidiary Issuer
        
Condensed Consolidating Financial Information        
Cost and expenses 1 1 2 5
Operating income (loss) (1) (1) (2) (5)
Other income (expense), net        
Interest income (expense), net (417) (129) (278) (266)
Equity in earnings 1,019 469 1,306 941
Other, net   (5) 1 5
Total other income (expense), net 602 335 1,029 680
Income from continuing operations before income tax expense 601 334 1,027 675
Income from continuing operations 601 334 1,027 675
Gain (loss) from discontinued operations, net of tax (1) (25) 3 (55)
Net Income 600 309 1,030 620
Net income attributable to controlling interest 600 309 1,030 620
Other comprehensive income (loss) before income taxes 63 93 57 72
Other comprehensive income 63 93 57 72
Total comprehensive income 663 402 1,087 692
Total comprehensive income attributable to controlling interest 663 402 1,087 692
Reportable Entity | Other Subsidiaries
        
Condensed Consolidating Financial Information        
Operating revenues 2,333 2,370 4,676 4,559
Cost and expenses 1,559 1,708 3,152 3,401
Loss on impairment   (37) (65) (37)
Gain (loss) on disposal of assets, net 1 (2) (2) (9)
Operating income (loss) 775 623 1,457 1,112
Other income (expense), net        
Interest income (expense), net 336 (3) 75 (3)
Other, net 8 (11) 5 (22)
Total other income (expense), net 344 (14) 80 (25)
Income from continuing operations before income tax expense 1,119 609 1,537 1,087
Income tax expense 72 132 152 151
Income from continuing operations 1,047 477 1,385 936
Gain (loss) from discontinued operations, net of tax (6) 14 (18) 41
Net Income 1,041 491 1,367 977
Net income (loss) attributable to noncontrolling interest 10 4 20 (4)
Net income attributable to controlling interest 1,031 487 1,347 981
Other comprehensive income (loss) before income taxes 1 14 8 22
Income taxes related to other comprehensive loss (3) (1) (3)  
Other comprehensive income (2) 13 5 22
Total comprehensive income 1,039 504 1,372 999
Total comprehensive income (loss) attributable to noncontrolling interest 10 4 20 (3)
Total comprehensive income attributable to controlling interest 1,029 500 1,352 1,002
Consolidating adjustments
        
Condensed Consolidating Financial Information        
Operating revenues (5) (6) (9) (11)
Cost and expenses (5) (6) (9) (11)
Other income (expense), net        
Equity in earnings (1,631) (796) (2,377) (1,601)
Total other income (expense), net (1,631) (796) (2,377) (1,601)
Income from continuing operations before income tax expense (1,631) (796) (2,377) (1,601)
Income from continuing operations (1,631) (796) (2,377) (1,601)
Net Income (1,631) (796) (2,377) (1,601)
Net income attributable to controlling interest (1,631) (796) (2,377) (1,601)
Total comprehensive income (1,631) (796) (2,377) (1,601)
Total comprehensive income attributable to controlling interest $ (1,631) $ (796) $ (2,377) $ (1,601)