Debt (Tables)

12 Months Ended

Dec. 31, 2019

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, 2019 and 2018 (dollars in millions):

	2019			2018
$400 million 6.45% Senior Notes due 2019	$	—		$	400
$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			—
$100 million 4.09% Promissory Note due 2039	86			89
$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	3,003			2,807
Unamortized issuance costs	(22		)	(19		)
Long-term Debt	$	2,981		$	2,788

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

Future principal payments due on long-term debt, excluding discounts, as of December 31, 2019, were as follows (dollars in millions):

	Calendar Year
	2020		2021		2022		2023		2024		Thereafter
Long-term debt	$	3	$	403	$	3	$	403	$	3	$	2,190

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, 2019 and 2018 (dollars in millions):

			Amount Utilized(1) December 31,
Current Capacity		Maturity Date	2019		2018		Basis of Fees
$	75	June 2021	$	15	$	34	Fixed
105 (2)		December 2021	105		106		Fixed
100		March 2022	99		—		Fixed
500		May 2022	375		395		Debt rating and utilization %
100		May 2023	61		61		Fixed
850		August 2023	20		18		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.