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Debt (Issued) (Details)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
May 24, 2019
USD ($)
Feb. 01, 2019
USD ($)
Oct. 25, 2018
USD ($)
Jan. 30, 2018
USD ($)
$ / shares
Oct. 17, 2017
USD ($)
May 05, 2017
USD ($)
Jul. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt                      
Proceeds from issuance of debt                 $ 1,056 $ 2,054 $ 1,144
Aggregate principal amount outstanding                 9,361 10,094  
Restricted cash and cash equivalents                 $ 558 429  
Equity component of convertible debt instruments                   172  
5.375% Senior Secured Notes due May 2023                      
Debt                      
Debt instrument interest rate stated percentage                 5.375%    
Aggregate principal amount outstanding                 $ 525    
5.875% Senior Secured Notes due January 2024                      
Debt                      
Debt instrument interest rate stated percentage             5.875%   5.875%    
Debt instrument face value             $ 750        
Proceeds from issuance of debt             $ 733        
Redemption price of debt instrument (as a percent)             100.00%        
Aggregate principal amount outstanding                 $ 667 750  
Restricted cash and cash equivalents             $ 63        
6.125% Senior Secured Notes due August 2025                      
Debt                      
Debt instrument interest rate stated percentage             6.125%   6.125%    
Debt instrument face value             $ 600        
Proceeds from issuance of debt             $ 586        
Redemption price of debt instrument (as a percent)             100.00%        
Aggregate principal amount outstanding                 $ 534 600  
Restricted cash and cash equivalents             $ 51        
7.75% Senior Secured Notes due October 2024                      
Debt                      
Debt instrument interest rate stated percentage                 7.75%    
Aggregate principal amount outstanding                 $ 420 480  
6.25% Senior Notes due December 2024                      
Debt                      
Debt instrument interest rate stated percentage                 6.25%    
Aggregate principal amount outstanding                 $ 437 500  
6.375% Senior Notes due December 2021                      
Debt                      
Debt instrument interest rate stated percentage                 6.375%    
Interest rate, as adjusted (as a percent)                 8.375%    
Aggregate principal amount outstanding                 $ 222 328  
3.80% Senior Notes due October 2022                      
Debt                      
Debt instrument interest rate stated percentage                 3.80%    
Interest rate, as adjusted (as a percent)                 5.80%    
Aggregate principal amount outstanding                 $ 190 411  
7.35% Senior Notes due December 2041                      
Debt                      
Debt instrument interest rate stated percentage                 7.35%    
Interest rate, as adjusted (as a percent)                 9.35%    
Aggregate principal amount outstanding                 $ 300 300  
Five-Year Revolving Credit Facility                      
Debt                      
Borrowing capacity, maximum               $ 1,000 1,300    
Aggregate minimum principal amount impacting maturity               $ 300      
Aggregate carrying amount assets pledged                 $ 4,400    
Consolidated indebtedness to total tangible capitalization ratio               0.60      
Minimum liquidity               $ 500      
Commitment fee percentage at period end                 0.625%    
Credit facility amount outstanding                 $ 0    
Letters of credit issued and outstanding                 13    
Credit facility available borrowing capacity                 $ 1,300    
Five-Year Revolving Credit Facility | Minimum                      
Debt                      
Commitment fee percentage at period end               0.375%      
Five-Year Revolving Credit Facility | Maximum                      
Debt                      
Commitment fee percentage at period end               1.00%      
Five-Year Revolving Credit Facility | Adjusted LIBOR                      
Debt                      
Spread on variable rate basis (as a percent)                 2.875%    
Percentage reduction to the calculated variable rate               1.00%      
Five-Year Revolving Credit Facility | Adjusted LIBOR | Minimum                      
Debt                      
Spread on variable rate basis (as a percent)               2.625%      
Five-Year Revolving Credit Facility | Adjusted LIBOR | Maximum                      
Debt                      
Spread on variable rate basis (as a percent)               3.375%      
7.25% Senior Notes due November 2025                      
Debt                      
Debt instrument interest rate stated percentage     7.25%           7.25%    
Debt instrument face value     $ 750                
Proceeds from issuance of debt     $ 735                
Redemption price of debt instrument (as a percent)     100.00%                
Aggregate principal amount outstanding                 $ 750 750  
7.50% Notes due April 2031                      
Debt                      
Debt instrument interest rate stated percentage         7.50%       7.50%    
Debt instrument face value         $ 750            
Proceeds from issuance of debt         $ 742            
Redemption price of debt instrument (as a percent)         100.00%            
Aggregate principal amount outstanding                 $ 588 588  
6.875% Senior Secured Notes due February 2027                      
Debt                      
Debt instrument interest rate stated percentage   6.875%             6.875%    
Debt instrument face value   $ 550                  
Proceeds from issuance of debt   $ 539                  
Redemption price of debt instrument (as a percent)   100.00%                  
Aggregate principal amount outstanding                 $ 550    
Restricted cash and cash equivalents   $ 19                  
5.375% Senior Secured Notes due May 2023                      
Debt                      
Debt instrument interest rate stated percentage 5.375%                    
Debt instrument face value $ 525                    
Proceeds from issuance of debt $ 517                    
Redemption price of debt instrument (as a percent) 100.00%                    
Restricted cash and cash equivalents $ 14                    
5.52% Senior Notes due May 2022                      
Debt                      
Debt instrument interest rate stated percentage           5.52%     5.52%    
Debt instrument face value           $ 410          
Proceeds from issuance of debt           $ 403          
Redemption price of debt instrument (as a percent)           100.00%          
Aggregate principal amount outstanding                 $ 200 282  
Senior Secured Notes                      
Debt                      
Aggregate carrying amount assets pledged                 $ 6,300 4,400  
Redemption price of debt instrument (as a percent)                 100.00%    
Restricted cash and cash equivalents                 $ 386 347  
0.50% Exchangeable Bonds due January 2023                      
Debt                      
Debt instrument interest rate stated percentage                 0.50%    
Debt instrument face value       $ 863              
Aggregate principal amount outstanding                 $ 863 $ 863  
Debt conversion ratio       0.09729756              
Debt conversion (in dollars per share) | $ / shares       $ 10.28              
Fair value of debt       $ 1,000              
Equity component of convertible debt instruments       $ 172