Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill and Other Intangible Assets [Abstract]

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, 2018	$	110	$	237	$	318	$	665
Acquisition						100		100
Other adjustments		2						2
Balance, December 31, 2019		112		237		418		767
Acquisitions						18		18
Balance, December 31, 2020	$	112	$	237	$	436	$	785

Other Intangible Assets

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

	December 31, 2020				December 31, 2019
	Gross				Gross
	Carrying		Accumulated		Carrying		Accumulated
	Amount		Amortization		Amount		Amortization
(In millions)
Finite-lived intangible assets:
Customer relationships	$	647	$	111	$	611	$	76
Other		71		61		71		34
Total finite-lived intangible assets		718		172		682		110
Indefinite-lived intangible assets		64				75
Total other intangible assets	$	782	$	172	$	757	$	110