Debt (Tables)

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Schedule of debt instruments

Debt is composed of the following obligations.

December 31
(In millions)	2016		2015
Short term debt:
Senior notes of CNAF, 6.500%, face amount of $350, due August 15, 2016	$	—	$	350
Long term debt:
Senior notes of CNAF:
6.950%, face amount of $150, due January 15, 2018	150		150
7.350%, face amount of $350, due November 15, 2019	349		349
5.875%, face amount of $500, due August 15, 2020	498		497
5.750%, face amount of $400, due August 15, 2021	398		397
3.950%, face amount of $550, due May 15, 2024	546		546
4.500%, face amount of $500, due March 1, 2026	498		—
Debenture of CNAF, 7.250%, face amount of $243, due November 15, 2023	241		241
Subordinated variable rate debt of Hardy, face amount of $30, due September 15, 2036	30		30
Total long term debt	2,710		2,210
Total debt	$	2,710	$	2,560

Maturity of debt

The combined aggregate maturities for debt as of December 31, 2016 are presented in the following table.

(In millions)
2017	$	—
2018	150
2019	350
2020	500
2021	400
Thereafter	1,323
Less discount	(13		)
Total	$	2,710