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FINANCING ARRANGEMENTS - Senior Unsecured Notes (Details) - USD ($)
3 Months Ended 12 Months Ended
Jan. 16, 2020
Dec. 16, 2019
May 23, 2019
Mar. 08, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 30, 2019
Debt Instrument [Line Items]                
Redemption price percentage to change in control (as a percent)         101.00%      
Repayments of long-term debt         $ 1,459,000,000 $ 1,621,000,000    
Settled Litigation | US Securities Litigation | NEW JERSEY                
Debt Instrument [Line Items]                
Settlement, escrow fund included in restricted cash   $ 1,210,000,000     $ 1,010,000,000   $ 1,210,000,000  
Unsecured Debt                
Debt Instrument [Line Items]                
Redemption price percentage to change in control (as a percent)         101.00%      
Repurchased principal amount         $ 17,000,000      
Repayments of long-term debt         $ 16,000,000      
Unsecured Debt | 8.50% Senior Notes Due January 2027                
Debt Instrument [Line Items]                
Stated interest rate on debt (as a percent)       8.50% 8.50%      
Principal amount       $ 1,000,000,000        
Unsecured Debt | 7.00 % Senior Notes Due January 2028                
Debt Instrument [Line Items]                
Stated interest rate on debt (as a percent)     7.00%   7.00%      
Proceeds from debt issuance     $ 750,000,000          
Unsecured Debt | 7.25 % Senior Notes Due May 2029                
Debt Instrument [Line Items]                
Stated interest rate on debt (as a percent)     7.25%   7.25%      
Proceeds from debt issuance     $ 750,000,000          
Unsecured Debt | 5.875% Senior Notes Due May 2023                
Debt Instrument [Line Items]                
Stated interest rate on debt (as a percent)       5.875% 5.875%      
Repurchased principal amount     1,118,000,000          
Repayments of long-term debt $ 1,240,000,000     $ 584,000,000        
Unsecured Debt | 5.50% Senior Notes Due March 2023                
Debt Instrument [Line Items]                
Stated interest rate on debt (as a percent)       5.50% 5.50%      
Repurchased principal amount     $ 382,000,000          
Repayments of long-term debt       $ 216,000,000        
Unsecured Debt | 5.00% Senior Notes Due January 2028                
Debt Instrument [Line Items]                
Stated interest rate on debt (as a percent)         5.00%     5.00%
Principal amount               $ 1,250,000,000
Unsecured Debt | 5.25% Senior Notes Due January 2030                
Debt Instrument [Line Items]                
Stated interest rate on debt (as a percent)         5.25%     5.25%
Principal amount               $ 1,250,000,000