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Capitalization - Additional Information (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 06, 2023
USD ($)
$ / shares
Mar. 31, 2023
USD ($)
dealer
$ / shares
Jun. 30, 2023
USD ($)
shares
Mar. 31, 2023
USD ($)
$ / shares
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
shares
Feb. 28, 2023
USD ($)
Debt Instrument [Line Items]                
Number of dealors | dealer   2            
Authorized repurchased amount   $ 1,000   $ 1,000        
Par value (in usd per share) | $ / shares   $ 0.10   $ 0.10        
Repurchase of common shares         $ 1,000 $ 0 $ 1,000  
Shares repurchased (in shares) | shares     1,812,497       8,730,766  
Par value of shares acquired (in usd per share) | $ / shares $ 91.63              
Common stock repurchases $ 800   $ 2 $ 1,008        
Adjustment to APIC $ 200              
Adjustments to APIC reflecting fair value of common shares issued     $ 169          
5.20% Debentures Due 2033 | Debentures                
Debt Instrument [Line Items]                
Long-term debt               $ 500
Interest rate (percent)               5.20%