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Revenue from Contracts with Customers
 6 Months Ended
Jun. 30, 2019
Revenue from Contract with Customer [Abstract]  
Revenue from Contracts with Customers Revenue from Contracts with Customers
Disaggregation of Revenue
The following table summarizes revenue from contracts with customers by principal service line (in millions):
 
 
Three Months Ended June 30
 
Six Months Ended June 30
 
 
2019
 
2018
 
2019
 
2018
Commercial Risk Solutions
 
$
1,167

 
$
1,166

 
$
2,285

 
$
2,350

Reinsurance Solutions
 
420

 
380

 
1,208

 
1,122

Retirement Solutions
 
419

 
431

 
839

 
855

Health Solutions
 
317

 
309

 
803

 
760

Data & Analytic Services
 
286

 
277

 
622

 
571

Elimination
 
(3
)
 
(2
)
 
(8
)
 
(7
)
Total revenue
 
$
2,606

 
$
2,561

 
$
5,749

 
$
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
 
Six Months Ended June 30
 
 
2019
 
2018
 
2019
 
2018
United States
 
$
1,146

 
$
1,125

 
$
2,307

 
$
2,241

Americas other than United States
 
241

 
243

 
467

 
480

United Kingdom
 
400

 
413

 
852

 
897

Europe, Middle East, & Africa other than United Kingdom
 
501

 
493

 
1,510

 
1,472

Asia Pacific
 
318

 
287

 
613

 
561

Total revenue
 
$
2,606

 
$
2,561

 
$
5,749

 
$
5,651



Contract Costs

An analysis of the changes in the net carrying amount of costs to fulfill contracts with customers are as follows (in millions):
 
 
Three Months Ended June 30
 
Six Months Ended June 30
 
 
2019
 
2018
 
2019
 
2018
Balance at beginning of period
 
$
236

 
$
240

 
$
329

 
$
298

Additions
 
336

 
341

 
682

 
711

Amortization
 
(357
)
 
(353
)
 
(796
)
 
(785
)
Impairment
 
—

 
—

 
—

 
—

Foreign currency translation and other
 
1

 
(12
)
 
1

 
(8
)
Balance at end of period
 
$
216

 
$
216

 
$
216

 
$
216



An analysis of the changes in the net carrying amount of costs to obtain contracts with customers are as follows (in millions):
 
 
Three Months Ended June 30
 
Six Months Ended June 30
 
 
2019
 
2018
 
2019
 
2018
Balance at beginning of period
 
$
155

 
$
144

 
$
156

 
$
145

Additions
 
17

 
13

 
26

 
21

Amortization
 
(11
)
 
(11
)
 
(22
)
 
(21
)
Impairment
 
—

 
—

 
—

 
—

Foreign currency translation and other
 
—

 
(2
)
 
1

 
(1
)
Balance at end of period
 
$
161

 
$
144

 
$
161

 
$
144