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Debt - Senior Notes (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2020
Jul. 31, 2020
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Mar. 31, 2020
Jul. 31, 2014
Debt Instrument [Line Items]                    
Principal amount       $ 7,750,000,000   $ 7,750,000,000   $ 7,750,000,000    
Repayment of debt           $ 1,771,000,000 $ 1,550,000,000      
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       67,000,000 $ 73,000,000 $ 211,000,000 $ 232,000,000      
Fair value of long-term debt       $ 8,200,000,000   $ 8,200,000,000   7,900,000,000    
Senior Notes | 2.150% Senior notes due 2020                    
Debt Instrument [Line Items]                    
Interest rate     2.15% 2.15%   2.15%        
Debt repaid     $ 500,000,000              
Principal amount       $ 0   $ 0   500,000,000    
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              
Senior Notes | 1.900% Senior notes due 2025                    
Debt Instrument [Line Items]                    
Debt instrument, face amount     $ 300,000,000           $ 500,000,000  
Interest rate     1.90% 1.90%   1.90%     1.90%  
Principal amount       $ 800,000,000   $ 800,000,000   0    
Senior Notes | 2.700% Senior notes due 2030                    
Debt Instrument [Line Items]                    
Debt instrument, face amount     $ 450,000,000           $ 500,000,000  
Interest rate     2.70% 2.70%   2.70%     2.70%  
Principal amount       $ 950,000,000   $ 950,000,000   0    
Senior Notes | 2.875% Senior notes due 2021                    
Debt Instrument [Line Items]                    
Debt instrument, face amount               $ 750,000,000    
Interest rate   2.875% 2.875% 2.875%   2.875%   2.875%    
Debt repaid $ 430,000,000 $ 2,000,000                
Repurchased face amount     $ 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              
Loss on extinguishment of debt     10,000,000              
Outstanding principal balance 419,000,000                  
Debt premium $ 11,000,000                  
Principal amount       $ 0   $ 0   $ 750,000,000    
Senior Notes | 3.250% Senior notes due 2020                    
Debt Instrument [Line Items]                    
Interest rate   3.25%   3.25%   3.25%        
Redemption price, percentage   100.00%                
Principal amount   $ 500,000,000   $ 0   $ 0   500,000,000    
Senior Notes | 6.000% Senior notes due 2056                    
Debt Instrument [Line Items]                    
Interest rate       6.00%   6.00%        
Redemption price, percentage           100.00%        
Principal amount       $ 750,000,000   $ 750,000,000   750,000,000    
Senior Notes | 3.800% Senior notes due 2022                    
Debt Instrument [Line Items]                    
Interest rate       3.80%   3.80%        
Principal amount       $ 750,000,000   $ 750,000,000   750,000,000    
Senior Notes | 2.750% Senior notes due 2023                    
Debt Instrument [Line Items]                    
Interest rate       2.75%   2.75%        
Principal amount       $ 750,000,000   $ 750,000,000   750,000,000    
Senior Notes | 3.600% Senior notes due 2027                    
Debt Instrument [Line Items]                    
Interest rate       3.60%   3.60%        
Principal amount       $ 850,000,000   $ 850,000,000   $ 850,000,000    
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 | 3.450% Senior notes due 2024                    
Debt Instrument [Line Items]                    
Debt instrument, face amount               $ 500,000,000    
Interest rate       3.45%   3.45%   3.45%    
Principal amount       $ 750,000,000   $ 750,000,000   $ 750,000,000    
Convertible Debt | LIBOR-based floating rate debt                    
Debt Instrument [Line Items]                    
Debt instrument, face amount     $ 400,000,000