Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Revenue:        
Services $ 4,118 $ 2,695 $ 10,971 $ 8,320
Product sales 1,326 1,138 3,709 3,546
Total revenue 5,444 3,833 14,680 11,866
Operating costs and expenses:        
Cost of services 3,686 2,743 10,242 8,476
Cost of sales 1,069 919 3,008 2,843
General and administrative 55 43 185 132
Impairments and other charges 0 0 262 3,189
Merger-related costs and termination fee 0 0 0 4,057
Total operating costs and expenses 4,810 3,705 13,697 18,697
Operating income (loss) 634 128 983 (6,831)
Interest expense, net of interest income (115) (141) (478) (502)
Other, net (23) (39) (67) (117)
Income (loss) from continuing operations before income taxes 496 (52) 438 (7,450)
Income tax benefit (provision) (135) 59 (81) 1,836
Income (loss) from continuing operations 361 7 357 (5,614)
Income (loss) from discontinued operations, net 0 0 0 (2)
Net income (loss) 361 7 357 (5,616)
Net (income) loss attributable to noncontrolling interest 4 (1) 4 2
Net income (loss) attributable to company 365 6 361 (5,614)
Amounts attributable to company shareholders:        
Income (loss) from continuing operations 365 6 361 (5,612)
Income (loss) from discontinued operations, net 0 0 0 (2)
Net income (loss) attributable to company $ 365 $ 6 $ 361 $ (5,614)
Basic net income (loss) per share $ 0.42 $ 0.01 $ 0.42 $ (6.53)
Diluted income (loss) per share $ 0.42 $ 0.01 $ 0.41 $ (6.53)
Basic weighted average common shares outstanding (in shares) 872 862 869 860
Diluted weighted average common shares outstanding (in shares) 873 864 872 860
Cash dividends per share $ 0.18 $ 0.18 $ 0.54 $ 0.54