Debt (Tables)

12 Months Ended

Dec. 31, 2024

Debt Disclosure [Abstract]

Debt outstanding [Table Text Block]

Debt outstanding was as follows:

(at December 31, in millions)	2024		2023
Short-term:
Commercial paper	$	100	$	100
Total short-term debt	100		100
Long-term:
7.75% Senior notes due April 15, 20261	200		200
7.625% Junior subordinated debentures due December 15, 2027 (effective interest rate 6.147%)	125		125
6.375% Senior notes due March 15, 20331	500		500
6.75% Senior notes due June 20, 20361	400		400
6.25% Senior notes due June 15, 20371	800		800
5.35% Senior notes due November 1, 20401	750		750
4.60% Senior notes due August 1, 20431	500		500
4.30% Senior notes due August 25, 20451	400		400
8.50% Junior subordinated debentures due December 15, 2045 (effective interest rate 6.362%)	56		56
3.75% Senior notes due May 15, 20461	500		500
8.312% Junior subordinated debentures due July 1, 2046 (effective interest rate 6.362%)	73		73
4.00% Senior notes due May 30, 20471	700		700
4.05% Senior notes due March 7, 20481	500		500
4.10% Senior notes due March 4, 20491	500		500
2.55% Senior notes due April 27, 20501	500		500
3.05% Senior notes due June 8, 20511	750		750
5.45% Senior notes due May 25, 20531	750		750
Total long-term debt	8,004		8,004
Total debt principal	8,104		8,104
Unamortized fair value adjustment	34		35
Unamortized debt issuance costs	(105)		(108)
Total debt	$	8,033	$	8,031

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(1)The effective interest rate to maturity does not differ materially from the issued rate.

Merger-related unamortized fair value adjustments [Table Text Block]

The following table presents merger-related unamortized fair value adjustments:

				Unamortized Fair Value Purchase Adjustment at December 31,
(in millions)	Issue Rate		Maturity Date	2024		2023
Junior subordinated debentures	7.625	%	Dec. 2027	$	5	$	6
	8.500	%	Dec. 2045	13		13
	8.312	%	Jul. 2046	16		16
Total				$	34	$	35