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Debt - Long-term Debt (Details)
$ in Millions
1 Months Ended 9 Months Ended
Mar. 31, 2021
USD ($)
Oct. 31, 2021
Sep. 30, 2021
USD ($)
tranche
Debt Instrument [Line Items]      
Number of tranches of senior notes | tranche     3
Debt instrument redemption price (in percentage)   100.00%  
Debt instrument change of control redemption price (in percentage)   101.00%  
Senior notes | September 2021 Issuance      
Debt Instrument [Line Items]      
Issuance costs     $ 17
Senior notes | Senior Notes Due September 2028, 1.50%, First Tranche      
Debt Instrument [Line Items]      
Debt instrument face amount     $ 1,000
Debt instrument interest rate (in percentage)     1.50%
Debt instrument unamortized discount     $ 4
Senior notes | Senior Notes Due September 2031, 1.875%, Second Tranche      
Debt Instrument [Line Items]      
Debt instrument face amount     $ 1,000
Debt instrument interest rate (in percentage)     1.875%
Debt instrument unamortized discount     $ 6
Senior notes | Senior Notes Due September 2051, 2.75%, Third Tranche      
Debt Instrument [Line Items]      
Debt instrument face amount     $ 1,000
Debt instrument interest rate (in percentage)     2.75%
Debt instrument unamortized discount     $ 11
Senior notes | Senior Notes Due April 2021, 2.00%      
Debt Instrument [Line Items]      
Debt instrument interest rate (in percentage) 2.00%    
Repayments of debt $ 1,350