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Notes Payable - Schedule of Long Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Sep. 17, 2021
Dec. 31, 2020
Aug. 13, 2018
Aug. 28, 2012
Debt Instrument [Line Items]          
Debt $ 3,096   $ 2,662    
4.50% Notes, net of discount          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage       4.50%  
4.50% Notes, net of discount | Unsecured notes          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 4.50%        
Debt $ 444   443    
5.50% Notes, net of discount | Unsecured notes          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 5.50%       5.50%
Debt $ 400   399    
3.40% Notes, net of discount          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 3.40%        
Debt $ 643   643    
2.45% Notes, net of discount          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 2.45%        
Debt $ 593   592    
3.20% Senior Notes          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 3.20% 3.20%      
Debt $ 443   0    
Revolving Credit Facility | Line of Credit | Revolving Credit Facility          
Debt Instrument [Line Items]          
Debt $ 4   4    
5.50% F& G Notes          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 5.50%        
Debt $ 577   $ 589