Note 7. Goodwill and Other Intangible Assets

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


				CNA			Diamond		Boardwalk		Loews
	Total			Financial			Offshore		Pipeline		Hotels & Co		Corporate
(In millions)

Balance, December 31, 2016	$	346		$	109		$	-	$	237	$	-	$	-
Acquisition		310												310
Other adjustments		3			3
Balance, December 31, 2017		659			112			-		237		-		310
Acquisition		8												8
Other adjustments		(2	)		(2	)
Balance, December 31, 2018	$	665		$	110		$	-	$	237	$	-	$	318

The increase in the goodwill balance as of December 31, 2017 primarily reflects the acquisition of Consolidated Container in 2017. The increase as of December 31, 2018 reflects the acquisitions made by Consolidated Container in 2018. See Note 2 for further discussion on these acquisitions.

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


	December 31, 2018				December 31, 2017
	Gross				Gross
	Carrying		Accumulated		Carrying		Accumulated
	Amount		Amortization		Amount		Amortization
(In millions)

Finite-lived intangible assets:
Customer relationships	$	532	$	47	$	518	$	22
Other		72		20		74		13
Total finite-lived intangible assets		604		67		592		35

Indefinite-lived intangible assets		74				81
Total other intangible assets	$	678	$	67	$	673	$	35

The balance of finite-lived intangible assets as of December 31, 2017 includes assets from the acquisition of Consolidated Container. The balance as of December 31, 2018 includes assets from acquisitions made by Consolidated Container.

Amortization expense for the years ended December 31, 2018, 2017 and 2016 of $32 million, $20 million and $3 million is reported in Operating expenses and other on the Company’s Consolidated Statements of Income. At December 31, 2018, estimated amortization expense in each of the next five years is approximately $34 million in 2019, $33 million in 2020, $32 million in 2021, $31 million in 2022 and $31 million in 2023.