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Debt (Tables)
 12 Months Ended
Dec. 31, 2023
Debt Disclosure [Abstract]  
Schedule of Debt
Long-term Debt by Issuance
As of December 31,
20232022
Revolving Credit Facilities$— $— 
Senior Notes and Debentures  
2.8% Notes, due 2029
600 600 
5.95% Notes, due 2036
300 300 
6.625% Notes, due 2040
295 295 
6.1% Notes, due 2041
409 409 
6.625% Notes, due 2042
178 178 
4.3% Notes, due 2043
300 300 
4.4% Notes, due 2048
500 500 
3.6% Notes, due 2049
800 800 
2.9% Notes, due 2051
600 600 
Junior Subordinated Debentures  
3-Month term SOFR + 0.26161% + 2.125% Notes, due 2067 [1]
500 500 
Total Notes and Debentures4,482 4,482 
Unamortized discount and debt issuance cost [2](120)(125)
Total Debt4,362 4,357 
Less: Current maturities— — 
Long-Term Debt$4,362 $4,357 
[1]The Company has an interest rate swap agreement expiring February 15, 2027 to effectively convert the variable interest payments for this debenture into fixed interest payments of approximately 4.39%. See Junior Subordinated Debentures section below for further discussion of interest rate terms for the periods ended December 31, 2023 and 2022, respectively.
[2]This amount includes unamortized discount of $70 and $72 as of December 31, 2023 and 2022, respectively, on the 6.1% Notes, due 2041.
Long-Term Debt Maturities
Long-term Debt Maturities (at par value) as of December 31, 2023
2024 - Current maturities$— 
2025$— 
2026$— 
2027$— 
2028$— 
Thereafter$4,482