Revenue from Contracts with Customers (Tables)

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

The following table summarizes revenue from contracts with customers by principal service line (in millions):



	Three months ended June 30, 2018			Six months ended June 30, 2018
Commercial Risk Solutions	$	1,166		$	2,350
Reinsurance Solutions	380			1,122
Retirement Solutions	431			855
Health Solutions	309			760
Data & Analytic Services	277			571
Elimination	(2		)	(7		)
Total revenue	$	2,561		$	5,651

Consolidated revenue from contracts with customers by geographic area, which is attributed on the basis of where the services are performed, is as follows (in millions):



	Three months ended June 30, 2018		Six months ended June 30, 2018
United States	$	1,125	$	2,241
Americas other than United States	243		480
United Kingdom	413		897
Europe, Middle East, & Africa other than United Kingdom	493		1,472
Asia Pacific	287		561
Total revenue	$	2,561	$	5,651

Capitalized Contract Cost

The changes in the net carrying amount of costs to fulfill contracts with customers are as follows (in millions):



	Three months ended June 30, 2018			Six months ended June 30, 2018
Balance at beginning of period ⁽¹⁾	$	240		$	298
Additions	341			711
Amortization	(353		)	(785		)
Impairment	—			—
Foreign currency translation and other	(12		)	(8		)
Balance at end of period	$	216		$	216


(1)	Upon adoption of the new revenue recognition standard on January 1, 2018, Aon capitalized $298 million of costs to fulfill contracts with customers.

The changes in the net carrying amount of costs to obtain contracts with customers are as follows (in millions):



	Three months ended June 30, 2018			Six months ended June 30, 2018
Balance at beginning of period ⁽¹⁾	$	144		$	145
Additions	13			21
Amortization	(11		)	(21		)
Impairment	—			—
Foreign currency translation and other	(2		)	(1		)
Balance at end of period	$	144		$	144


(1)	Upon adoption of the new revenue recognition standard on January 1, 2018, Aon capitalized $145 million of costs to obtain contracts with customers.