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Debt - Senior Notes (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 29, 2020
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Mar. 31, 2020
Jul. 31, 2014
Debt Instrument [Line Items]                  
Repayment of debt         $ 839,000,000 $ 0      
Interest Rate Swap | Designated as Hedging Instrument | Fair Value Hedging                  
Debt Instrument [Line Items]                  
Derivative liability             $ 2,400,000,000   $ 2,400,000,000
Senior Notes                  
Debt Instrument [Line Items]                  
Debt instrument, face amount               $ 1,000,000,000  
Redemption price, percentage, in the event of change of control         101.00%        
Interest expense     $ 74,000,000 $ 79,000,000 $ 144,000,000 $ 159,000,000      
Fair value of long-term debt   $ 9,200,000,000 $ 9,200,000,000   $ 9,200,000,000   $ 7,900,000,000    
Senior Notes | 2.150% Senior notes due 2020                  
Debt Instrument [Line Items]                  
Debt repaid   $ 500,000,000              
Interest rate   2.15% 2.15%   2.15%        
Senior Notes | 1.900% Senior notes due 2025 and 2.700% Senior notes due 2030                  
Debt Instrument [Line Items]                  
Debt instrument, face amount   $ 750,000,000 $ 750,000,000   $ 750,000,000        
Senior Notes | 1.900% Senior notes due 2025                  
Debt Instrument [Line Items]                  
Interest rate   1.90% 1.90%   1.90%     1.90%  
Debt instrument, face amount   $ 300,000,000 $ 300,000,000   $ 300,000,000     $ 500,000,000  
Senior Notes | 2.700% Senior notes due 2030                  
Debt Instrument [Line Items]                  
Interest rate   2.70% 2.70%   2.70%     2.70%  
Debt instrument, face amount   $ 450,000,000 $ 450,000,000   $ 450,000,000     $ 500,000,000  
Senior Notes | 6.000% Senior notes due 2056                  
Debt Instrument [Line Items]                  
Interest rate   6.00% 6.00%   6.00%        
Redemption price, percentage         100.00%        
Senior Notes | 3.800% Senior notes due 2022                  
Debt Instrument [Line Items]                  
Interest rate   3.80% 3.80%   3.80%        
Senior Notes | 2.750% Senior notes due 2023                  
Debt Instrument [Line Items]                  
Interest rate   2.75% 2.75%   2.75%        
Senior Notes | 3.600% Senior notes due 2027                  
Debt Instrument [Line Items]                  
Interest rate   3.60% 3.60%   3.60%        
Senior Notes | 2.200% Senior notes due 2019                  
Debt Instrument [Line Items]                  
Interest rate             2.20%    
Repayment of debt             $ 1,150,000,000    
Senior Notes | 2.875% Senior notes due 2021                  
Debt Instrument [Line Items]                  
Interest rate   2.875% 2.875%   2.875%   2.875%    
Debt instrument, face amount             $ 750,000,000    
Repurchased face amount   $ 750,000,000 $ 750,000,000   $ 750,000,000        
Percentage of principal amount redeemed   44.00%              
Payments for repurchase of debt   $ 339,000,000              
Carrying amount of repurchased debt   329,000,000 $ 329,000,000   $ 329,000,000        
Loss on extinguishment of debt   $ 10,000,000              
Senior Notes | 2.875% Senior notes due 2021 | Subsequent Event                  
Debt Instrument [Line Items]                  
Interest rate 2.875%                
Payments for repurchase of debt $ 2,000,000                
Carrying amount of repurchased debt $ 419,000,000                
Senior Notes | 3.450% Senior notes due 2024                  
Debt Instrument [Line Items]                  
Interest rate   3.45% 3.45%   3.45%   3.45%    
Debt instrument, face amount             $ 500,000,000    
Convertible Debt | LIBOR-based floating rate debt                  
Debt Instrument [Line Items]                  
Debt instrument, face amount   $ 400,000,000 $ 400,000,000   $ 400,000,000