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Consolidated Statements of Equity (Parenthetical) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jul. 09, 2014
Dec. 31, 2014
Dec. 31, 2013
Issuance of common stock (in shares)   131,017  
Issuance of shares of nonvested stock (in shares)   1,110,600  
Predecessor      
Issuance of new equity interests in connection with emergence from Chapter 11 in connection with the Rights Offering $ 100    
Issuance of new equity interests in connection with emergence from Chapter 11 in connection with the Rights Offering (in shares) 60,299,757    
Issuance of shares of nonvested stock (in shares)     200,634
Issuance of shares of nonvested stock, forfeitures (in shares)     21,500