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Debt (Details) - Debt Issuance - USD ($)
$ in Millions
12 Months Ended
Apr. 27, 2020
Mar. 04, 2019
Mar. 07, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument            
Net proceeds of issuance, after the deduction of the underwriting discount and expenses       $ 490 $ 492 $ 591
Senior Notes [Member] | 2.55% Senior notes due April 27, 2050 [Member]            
Debt Instrument            
Debt, principal amount $ 500          
Interest rate (percent) 2.55%     2.55%    
Net proceeds of issuance, after the deduction of the underwriting discount and expenses $ 490          
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 0.25%          
Senior Notes [Member] | 4.10% Senior notes due March 4, 2049 [Member]            
Debt Instrument            
Debt, principal amount   $ 500        
Interest rate (percent)   4.10%   4.10% 4.10%  
Net proceeds of issuance, after the deduction of the underwriting discount and expenses   $ 492        
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   0.20%        
Senior Notes [Member] | 4.05% Senior notes due March 7, 2048 [Member]            
Debt Instrument            
Debt, principal amount     $ 500      
Interest rate (percent)     4.05% 4.05% 4.05%  
Net proceeds of issuance, after the deduction of the underwriting discount and expenses     $ 491      
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%