v2.4.0.8
Condensed Consolidating Financial Information (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Condensed Consolidating Financial Information        
Operating revenues $ 2,397 $ 2,329 $ 4,594 $ 4,439
Cost and expenses 1,756 2,464 3,473 4,060
Loss on impairment (37)   (37) (140)
Loss on disposal of assets, net (2) (7) (9) (10)
Operating income (loss) 602 (142) 1,075 229
Other income (expense), net        
Interest expense, net (135) (170) (275) (335)
Other, net (16) (6) (17) (24)
Total other income (expense), net (151) (176) (292) (359)
Income from continuing operations before income tax expense 451 (318) 783 (130)
Income tax expense (benefit) 130 (15) 149 19
Income (loss) from continuing operations 321 (303) 634 (149)
Gain (loss) from discontinued operations, net of tax (10)   (10) (136)
Net income (loss) 311 (303) 624 (285)
Net income (loss) attributable to noncontrolling interest 4 1 (4) 9
Net income (loss) attributable to controlling interest 307 (304) 628 (294)
Other comprehensive income (loss) before income taxes 107 14 88 (1)
Income taxes related to other comprehensive loss (1) 1   (2)
Other comprehensive income (loss), net of income taxes 106 15 88 (3)
Total comprehensive income (loss) 417 (288) 712 (288)
Total comprehensive income (loss) attributable to noncontrolling interest 4 1 (3) 9
Total comprehensive income (loss) attributable to controlling interest 413 (289) 715 (297)
Parent Guarantor
        
Condensed Consolidating Financial Information        
Cost and expenses 17 21 26 32
Operating income (loss) (17) (21) (26) (32)
Other income (expense), net        
Interest expense, net (3) (4) (6) (7)
Equity in earnings 327 (279) 660 (255)
Total other income (expense), net 324 (283) 654 (262)
Income from continuing operations before income tax expense 307 (304) 628 (294)
Income (loss) from continuing operations 307 (304) 628 (294)
Net income (loss) 307 (304) 628 (294)
Net income (loss) attributable to controlling interest 307 (304) 628 (294)
Other comprehensive income (loss) before income taxes   1 (6) (4)
Other comprehensive income (loss), net of income taxes   1 (6) (4)
Total comprehensive income (loss) 307 (303) 622 (298)
Total comprehensive income (loss) attributable to controlling interest 307 (303) 622 (298)
Subsidiary Issuer
        
Condensed Consolidating Financial Information        
Cost and expenses 1 1 5 2
Operating income (loss) (1) (1) (5) (2)
Other income (expense), net        
Interest expense, net (129) (139) (266) (273)
Equity in earnings 469 (186) 941 (16)
Other, net (5) 18 5 9
Total other income (expense), net 335 (307) 680 (280)
Income from continuing operations before income tax expense 334 (308) 675 (282)
Income (loss) from continuing operations 334 (308) 675 (282)
Gain (loss) from discontinued operations, net of tax (25)   (55)  
Net income (loss) 309 (308) 620 (282)
Net income (loss) attributable to controlling interest 309 (308) 620 (282)
Other comprehensive income (loss) before income taxes 93 7 72  
Other comprehensive income (loss), net of income taxes 93 7 72  
Total comprehensive income (loss) 402 (301) 692 (282)
Total comprehensive income (loss) attributable to controlling interest 402 (301) 692 (282)
Other Subsidiaries
        
Condensed Consolidating Financial Information        
Operating revenues 2,403 2,335 4,605 4,450
Cost and expenses 1,744 2,448 3,453 4,037
Loss on impairment (37)   (37) (140)
Loss on disposal of assets, net (2) (7) (9) (10)
Operating income (loss) 620 (120) 1,106 263
Other income (expense), net        
Interest expense, net (3) (27) (3) (55)
Other, net (11) (24) (22) (33)
Total other income (expense), net (14) (51) (25) (88)
Income from continuing operations before income tax expense 606 (171) 1,081 175
Income tax expense (benefit) 130 (15) 149 19
Income (loss) from continuing operations 476 (156) 932 156
Gain (loss) from discontinued operations, net of tax 15   45 (136)
Net income (loss) 491 (156) 977 20
Net income (loss) attributable to noncontrolling interest 4 1 (4) 9
Net income (loss) attributable to controlling interest 487 (157) 981 11
Other comprehensive income (loss) before income taxes 14 6 22 3
Income taxes related to other comprehensive loss (1) 1   (2)
Other comprehensive income (loss), net of income taxes 13 7 22 1
Total comprehensive income (loss) 504 (149) 999 21
Total comprehensive income (loss) attributable to noncontrolling interest 4 1 (3) 9
Total comprehensive income (loss) attributable to controlling interest 500 (150) 1,002 12
Consolidating adjustments
        
Condensed Consolidating Financial Information        
Operating revenues (6) (6) (11) (11)
Cost and expenses (6) (6) (11) (11)
Other income (expense), net        
Equity in earnings (796) 465 (1,601) 271
Total other income (expense), net (796) 465 (1,601) 271
Income from continuing operations before income tax expense (796) 465 (1,601) 271
Income (loss) from continuing operations (796) 465 (1,601) 271
Net income (loss) (796) 465 (1,601) 271
Net income (loss) attributable to controlling interest (796) 465 (1,601) 271
Total comprehensive income (loss) (796) 465 (1,601) 271
Total comprehensive income (loss) attributable to controlling interest $ (796) $ 465 $ (1,601) $ 271