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Debt (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 08, 2021
Jun. 30, 2021
Jun. 30, 2020
Debt Instrument      
Net proceeds of issuance, after the deduction of the underwriting discount and expenses   $ 739 $ 490
Senior Notes [Member] | 3.050% Senior Notes due June 8, 2051 [Member]      
Debt Instrument      
Debt, principal amount $ 750    
Interest rate (percent) 3.05%    
Net proceeds of issuance, after the deduction of the underwriting discount and expenses $ 739    
Percentage of principal amount at which redemption price may be set 100.00%    
Basis points added to current Treasury rate used in calculation of alternative redemption price 0.15%