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Debt - Short-term and Long-term Debt by Issuance (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Schedule of Debt [Line Items]        
Revolving Credit Facilities $ 0   $ 0 $ 0
Total Notes and Debentures 4,482   4,482 4,482
Unamortized discount and debt issuance cost [2] 120   120 125
Total Debt 4,362   4,362 4,357
Less: Current maturities 0   0 0
Long-Term Debt $ 4,362   $ 4,362 4,357
Derivative, Fixed Interest Rate 4.39%   4.39%  
Interest rate derivatives        
Schedule of Debt [Line Items]        
Derivative, Maturity Date     Feb. 15, 2027  
2.8% Notes, due 2029        
Schedule of Debt [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 2.80%   2.80%  
Senior Notes and Debentures $ 600   $ 600 600
5.95% Notes, due 2036        
Schedule of Debt [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 5.95%   5.95%  
Senior Notes and Debentures $ 300   $ 300 300
6.625% Notes, due 2040        
Schedule of Debt [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 6.625%   6.625%  
Senior Notes and Debentures $ 295   $ 295 295
6.1% Notes, due 2041        
Schedule of Debt [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 6.10%   6.10%  
Senior Notes and Debentures $ 409   $ 409 409
Debt Instrument, Unamortized Discount $ 70   $ 70 72
Debt Instrument, Interest Rate, Effective Percentage 7.90%   7.90%  
6.625% Notes, due 2042        
Schedule of Debt [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 6.625%   6.625%  
Senior Notes and Debentures $ 178   $ 178 178
4.3% Notes, due 2043        
Schedule of Debt [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 4.30%   4.30%  
Senior Notes and Debentures $ 300   $ 300 300
4.4% Notes, due 2048        
Schedule of Debt [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 4.40%   4.40%  
Senior Notes and Debentures $ 500   $ 500 500
3.6% Notes, due 2049        
Schedule of Debt [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 3.60%   3.60%  
Senior Notes and Debentures $ 800   $ 800 800
2.9% Notes, due 2051        
Schedule of Debt [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 2.90%   2.90%  
Senior Notes and Debentures $ 600   $ 600 600
SOFR Plus Two Point One Two Five Percent Plus Zero Point Two Six One Six One Percent Junior Subordinated Notes Due Two Thousand Sixty Seven        
Schedule of Debt [Line Items]        
Debt Instrument, Description of Variable Rate Basis 3-month term Secured Overnight Financing Rate (“SOFR”) plus a spread adjustment of 0.26161% plus 2.125%.      
Junior Subordinated Debentures $ 500   $ 500 500
SOFR Plus Two Point One Two Five Percent Plus Zero Point Two Six One Six One Percent Junior Subordinated Notes Due Two Thousand Sixty Seven | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate        
Schedule of Debt [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 300.00%   300.00%  
SOFR Plus Two Point One Two Five Percent Plus Zero Point Two Six One Six One Percent Junior Subordinated Notes Due Two Thousand Sixty Seven | hig_Tenor Spread Adjustment        
Schedule of Debt [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 0.26161%   0.26161%  
SOFR Plus Two Point One Two Five Percent Plus Zero Point Two Six One Six One Percent Junior Subordinated Notes Due Two Thousand Sixty Seven | Credit Spread Adjustment        
Schedule of Debt [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 2.125%   2.125%  
LIBOR Plus Two Point One Two Five Percent Junior Subordinated Notes Due Two Thousand Sixty Seven [Member]        
Schedule of Debt [Line Items]        
Debt Instrument, Description of Variable Rate Basis   LIBOR plus 2.125%    
Junior Subordinated Debentures       $ 500