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Consolidated Statements of Member's/Stockholders' Equity - USD ($)
$ in Millions
Total
MEMBER'S EQUITY
COMMON STOCK
ADDITIONAL PAID-IN CAPITAL
ACCUMULATED OTHER COMPREHENSIVE LOSS
ACCUMULATED DEFICIT
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative effect of adoption of ASU 2016-09, Improvements to Employee Share-Based Payment Accounting | Predecessor           $ 0
Beginning balance (Predecessor) at Dec. 31, 2014   $ 0 $ 3 $ 19,159 $ (147) (12,652)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Contributions | Predecessor   0        
Distributions | Predecessor   0        
Issuance of common stock through conversion of debt to equity | Predecessor     1      
Common stock issued under employee stock benefit plans and other | Predecessor       35    
Share-based compensation | Predecessor       106    
Conversion of debt to equity | Predecessor       342    
Contribution from affiliate | Predecessor       0    
Other comprehensive (loss) income | Predecessor         (154)  
Net (loss) income | Predecessor $ 3,433 0       3,433
Ending balance (Predecessor) at Dec. 31, 2015 10,126 0 4 19,642 (301) (9,219)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative effect of adoption of ASU 2016-09, Improvements to Employee Share-Based Payment Accounting | Predecessor           42
Contributions | Predecessor   0        
Distributions | Predecessor   0        
Issuance of common stock through conversion of debt to equity | Predecessor     0      
Common stock issued under employee stock benefit plans and other | Predecessor       37    
Share-based compensation | Predecessor       121    
Conversion of debt to equity | Predecessor       0    
Contribution from affiliate | Predecessor       0    
Other comprehensive (loss) income | Predecessor         (86)  
Net (loss) income | Predecessor 677 0       677
Ending balance (Predecessor) at Dec. 31, 2016 10,917 0 4 19,800 (387) (8,500)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative effect of adoption of ASU 2016-09, Improvements to Employee Share-Based Payment Accounting | Predecessor           0
Contributions | Predecessor   0        
Distributions | Predecessor   0        
Issuance of common stock through conversion of debt to equity | Predecessor     0      
Common stock issued under employee stock benefit plans and other | Predecessor       30    
Share-based compensation | Predecessor       102    
Conversion of debt to equity | Predecessor       0    
Contribution from affiliate | Predecessor       0    
Other comprehensive (loss) income | Predecessor         80  
Net (loss) income | Predecessor 425 0       425
Ending balance (Predecessor) at Oct. 31, 2017 11,554 0 4 19,932 (307) (8,075)
Beginning balance (Predecessor) at Dec. 31, 2016 10,917 0 4 19,800 (387) (8,500)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net (loss) income 284          
Ending balance at Dec. 31, 2017 19,272 19,254 0 0 18 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative effect of adoption of ASU 2016-09, Improvements to Employee Share-Based Payment Accounting           0
Beginning balance (Predecessor) at Oct. 31, 2017 11,554 0 4 19,932 (307) (8,075)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net (loss) income (141)          
Ending balance at Dec. 31, 2017 19,272 19,254 0 0 18 0
Beginning balance at Nov. 01, 2017   19,617 0 0 0 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Contributions   28        
Distributions   (250)        
Issuance of common stock through conversion of debt to equity     0      
Common stock issued under employee stock benefit plans and other       0    
Share-based compensation       0    
Conversion of debt to equity       0    
Contribution from affiliate       0    
Other comprehensive (loss) income         18  
Net (loss) income   (141)       0
Ending balance at Dec. 31, 2017 $ 19,272 $ 19,254 $ 0 $ 0 $ 18 $ 0