v2.4.1.9
Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Summary Of Significant Accounting Policies [Abstract]  
Schedule Of Property Software And Equipment Depreciation Periods [Table Text Block]
Property, software and equipment are depreciated over the following periods:
Fixed Asset
 
Depreciation Period
Buildings and land improvements
 
3 - 40 years
Computer hardware and software
 
2 - 7 years
Furniture and equipment
 
3 - 10 years
Leasehold improvements
 
1 - 20 years
Schedule Of Amortization Period For Intangible Assets [Table Text Block]
Intangible assets are amortized using the straight-line method over the following periods:
Intangible Asset
 
Amortization Period
Purchased contract rights
 
5 - 15 years
Provider contracts
 
4 - 15 years
Customer relationships
 
3 - 15 years
Trade names
 
7 - 20 years
Schedule Of Allowance For Uncollectible Accounts [Table Text Block]
Activity in the allowance for uncollectible accounts for the years ended December 31, is summarized below ($ in millions):
 
2014
 
2013
 
2012
Allowances, beginning of year
$
1

 
$
1

 
$
1

Amounts charged to expense
8

 
3

 
1

Write-offs of uncollectible receivables
(4
)
 
(3
)
 
(1
)
Allowances, end of year
$
5

 
$
1

 
$
1