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Debt - Narrative (Details) - USD ($)
1 Months Ended 6 Months Ended
Sep. 30, 2018
Jun. 30, 2020
May 13, 2020
Senior Notes      
Debt Instrument [Line Items]      
Debt instrument, face amount     $ 2,000,000,000.0
Senior Notes | 2.25% senior notes due 2027      
Debt Instrument [Line Items]      
Principal amount     $ 1,000,000,000.0
Debt instrument, interest rate   2.25% 2.25%
Senior Notes | 2.65% senior notes due 2030      
Debt Instrument [Line Items]      
Principal amount     $ 1,000,000,000.0
Debt instrument, interest rate   2.65% 2.65%
Senior Notes | 2.7% senior notes due 2020      
Debt Instrument [Line Items]      
Debt instrument, interest rate   2.70%  
Repaid debt   $ 850,000,000  
Senior Notes | 4.75% senior notes due 2021      
Debt Instrument [Line Items]      
Debt instrument, interest rate   4.75%  
Revolving credit facility      
Debt Instrument [Line Items]      
Repaid debt $ 1,100,000,000    
Revolving credit facility | Line of Credit      
Debt Instrument [Line Items]      
Maximum borrowing capacity   $ 3,500,000,000