Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes in Goodwill

A summary of the changes in the carrying amount of goodwill is as follows:

	CNA			Boardwalk
	Financial			Pipelines		Corporate		Total
(In millions)
Balance, December 31, 2017	$	112		$	237	$	310	$	659
Acquisition							8		8
Other adjustments		(2	)						(2)
Balance, December 31, 2018		110			237		318		665
Acquisitions							100		100
Other adjustments		2							2
Balance, December 31, 2019	$	112		$	237	$	418	$	767

Schedule of Carrying Amount of Other Intangible Assets

A summary of the net carrying amount of other intangible assets is as follows:

	December 31, 2019				December 31, 2018
	Gross				Gross
	Carrying		Accumulated		Carrying		Accumulated
	Amount		Amortization		Amount		Amortization
(In millions)
Finite-lived intangible assets:
Customer relationships	$	611	$	76	$	532	$	47
Other		71		34		72		20
Total finite-lived intangible assets		682		110		604		67
Indefinite-lived intangible assets		75				74
Total other intangible assets	$	757	$	110	$	678	$	67