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Revenue from Contracts with Customers (Tables)
 12 Months Ended
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
The following table summarizes revenue from contracts with customers by principal service line (in millions):
 
 
Years ended December 31
 
 
2019
 
2018
 
2017
Commercial Risk Solutions
 
$
4,673

 
$
4,652

 
$
4,169

Reinsurance Solutions
 
1,686

 
1,563

 
1,429

Retirement Solutions
 
1,817

 
1,865

 
1,755

Health Solutions
 
1,667

 
1,596

 
1,515

Data & Analytic Services
 
1,184

 
1,105

 
1,140

Elimination
 
(14
)
 
(11
)
 
(10
)
Total revenue
 
$
11,013

 
$
10,770

 
$
9,998


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):
 
 
Years ended December 31
 
 
2019
 
2018
 
2017
United States
 
$
5,016

 
$
4,677

 
$
4,425

Americas other than United States
 
919

 
940

 
976

United Kingdom
 
1,502

 
1,555

 
1,436

Europe, Middle East, & Africa other than United Kingdom
 
2,338

 
2,413

 
2,025

Asia Pacific
 
1,238

 
1,185

 
1,136

Total revenue
 
$
11,013

 
$
10,770

 
$
9,998


Capitalized Contract Cost
Changes in the net carrying amount of costs to obtain contracts with customers are as follows (in millions):
 
 
2019
 
2018
Balance at beginning of period
 
$
156

 
$
145

Additions
 
58

 
53

Amortization
 
(44
)
 
(41
)
Impairment
 
—

 
—

Foreign currency translation and other
 
1

 
(1
)
Balance at end of period
 
$
171

 
$
156


Changes in the net carrying amount of costs to fulfill contracts with customers are as follows (in millions):
 
 
2019
 
2018
Balance at beginning of period
 
$
329

 
$
298

Additions
 
1,453

 
1,504

Amortization
 
(1,447
)
 
(1,465
)
Impairment
 
—

 
—

Foreign currency translation and other
 
—

 
(8
)
Balance at end of period
 
$
335

 
$
329