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Debt (Unsecured Fixed Rate Debt Securities Issued Under Current Shelf Registration) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
May 20, 2021
2.375% Notes Due 2031 [Member]    
Debt Instrument [Line Items]    
Issuance date May 20, 2021  
Note amount   $ 850
Interest rate   2.375%
Maturity date May 20, 2031  
3.200% Notes Due 2041 [Member]    
Debt Instrument [Line Items]    
Issuance date May 20, 2021  
Note amount   $ 1,000
Interest rate   3.20%
Maturity date May 20, 2041  
3.550% Notes Due 2061 [Member]    
Debt Instrument [Line Items]    
Issuance date May 20, 2021  
Note amount   $ 650
Interest rate   3.55%
Maturity date May 20, 2061