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Debt and Redeemable Preferred Securities of Subsidiaries (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument    
Scheduled maturity of long-term debt in 2020 $ 317  
Scheduled maturity of long-term debt in 2021 473  
Scheduled maturity of long-term debt in 2022 574  
Scheduled maturity of long-term debt in 2023 558  
Scheduled maturity of long-term debt in 2024 407  
2.875% Notes Due February 7, 2050    
Debt Instrument    
Face amount of note   $ 500
Interest rate of note   2.875%
3.10 notes due March 26, 2030 [Member]    
Debt Instrument    
Face amount of note   $ 750
Interest rate of note   3.10%
1.05% notes due September 15, 2027 [Member]    
Debt Instrument    
Face amount of note   $ 600
Interest rate of note   1.05%
2.00% Notes due November 2, 2031    
Debt Instrument    
Face amount of note $ 600  
Interest rate of note 2.00%  
Credit facility expiring June 2026    
Debt Instrument    
Revolving credit facility $ 2,000  
Credit facility expiring June 2022    
Debt Instrument    
Revolving credit facility $ 750