Debt (Tables)

12 Months Ended

Dec. 31, 2020

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments [Table Text Block]

The Company’s long-term debt consists of the following as of December 31, 2020 and 2019 (dollars in millions):

	2020		2019
$400 million 5.00% Senior Notes due 2021	$	400	$	400
$400 million 4.70% Senior Notes due 2023	399		399
$400 million 3.95% Senior Notes due 2026	400		400
$600 million 3.90% Senior Notes due 2029	599		599
$600 million 3.15% Senior Notes due 2030	597		—
$100 million 4.09% Promissory Note due 2039	83		86
$400 million 6.20% Subordinated Debentures due 2042	400		400
$400 million 5.75% Subordinated Debentures due 2056	400		400
$400 million Variable Rate Junior Subordinated Debentures due 2065	319		319
Sub-total	3,597		3,003
Unamortized issuance costs	(24)		(22)
Long-term Debt	$	3,573	$	2,981

Schedule of Maturities of Long-term Debt [Table Text Block]

Future principal payments due on long-term debt, excluding discounts, as of December 31, 2020, were as follows (dollars in millions):

	Calendar Year
	2021		2022		2023		2024		2025		Thereafter
Long-term debt	$	403	$	3	$	403	$	3	$	4	$	2,787

Schedule of Line of Credit Facilities [Table Text Block]

The following table provides additional information on the Company’s existing committed credit facilities as of December 31, 2020 and 2019 (dollars in millions):

			Amount Utilized(1) December 31,
Current Capacity		Maturity Date	2020		2019		Basis of Fees
$	75	June 2021	$	51	$	15	Fixed
100		August 2021	100		—		Fixed
150		September 2021	150		—		Fixed
107		March 2022	107		99		Fixed
500		May 2022	210		375		Debt rating and utilization %
100 (2)		December 2022	100		105		Fixed
100		May 2023	75		61		Fixed
850		August 2023	21		20		Senior unsecured long-term debt rating

(1)Represents issued but undrawn letters of credit. There was no cash borrowed for the periods presented.

(2)Foreign currency denominated facility, amounts presented are in U.S. dollars.