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DEBT - Second Lien Notes (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2015
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Oct. 31, 2014
Debt            
Outstanding borrowings     $ 5,139   $ 5,268  
Pre-tax deferred gain on repurchase of debt from proceeds of Second Lien Notes   $ 660 $ 4 $ 793    
Second Lien Notes            
Debt            
Percentage of principal amount at which notes can be redeemed in case of change control     101.00%      
Second Lien Notes | 8% Notes Due 2022            
Debt            
Interest rate (as a percent) 8.00%   8.00%   8.00%  
Outstanding borrowings     $ 2,250   $ 2,250  
Aggregate principal amount issued $ 2,250          
Second Lien Notes | 8% Notes Due 2022 | Prior to December 15, 2017, from proceeds of certain equity offerings            
Debt            
Percentage of principal amount at which notes can be redeemed prior to their maturity date     108.00%      
Redemption period start     Dec. 01, 2015      
Redemption period end     Dec. 14, 2017      
Second Lien Notes | 8% Notes Due 2022 | Prior to December 15, 2018            
Debt            
Percentage of principal amount at which notes can be redeemed prior to their maturity date     100.00%      
Redemption period start     Dec. 15, 2017      
Redemption period end     Dec. 14, 2018      
Second Lien Notes | 8% Notes Due 2022 | On or after December 15, 2018            
Debt            
Redemption period start     Dec. 15, 2018      
Redemption period end     Dec. 31, 2018      
Second Lien Notes | 8% Notes Due 2022 | 2019 and thereafter            
Debt            
Percentage of principal amount at which notes can be redeemed prior to their maturity date     100.00%      
Redemption period start     Jan. 01, 2019      
Redemption period end     Dec. 15, 2022      
Senior Notes (Unsecured)            
Debt            
Proceeds from Second Lien Notes used to reduce principal amount of senior note debt through exchange 2,800          
Pre-tax deferred gain on repurchase of debt from proceeds of Second Lien Notes $ 560          
Aggregate principal amount issued           $ 5,000
Percentage of principal amount at which notes can be redeemed in case of change control     101.00%      
Percentage of principal amount at which notes can be redeemed prior to their maturity date     100.00%      
Minimum | Second Lien Notes | 8% Notes Due 2022 | On or after December 15, 2018            
Debt            
Percentage of principal amount at which notes can be redeemed prior to their maturity date     102.00%      
Maximum | Second Lien Notes | 8% Notes Due 2022 | Prior to December 15, 2017, from proceeds of certain equity offerings            
Debt            
Percentage of principal amount that may be redeemed     35.00%      
Maximum | Second Lien Notes | 8% Notes Due 2022 | On or after December 15, 2018            
Debt            
Percentage of principal amount at which notes can be redeemed prior to their maturity date     104.00%