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Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2012
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Schedule of changes in balances of each component of accumulated other comprehensive income
The following tables present the changes in the balances of each component of accumulated other comprehensive income.
 
Year Ended Ended December 31, 2012

 
Net Unrealized
Gains (Losses) on
Investments
 
Cumulative
Translation
Adjustment
 
Cash Flow Hedge
 
Total Accumulated
Other
Comprehensive
Income
 
(in millions)
Balance, December 31, 2011
$
367

 
$
(8
)
 
$
9

 
$
368

Other comprehensive income (loss)
145

 
2

 
0

 
147

Balance, December 31, 2012
$
512

 
$
(6
)
 
$
9

 
$
515


Year Ended Ended December 31, 2011

 
Net Unrealized
Gains (Losses) on
Investments
 
Cumulative
Translation
Adjustment
 
Cash Flow Hedge
 
Total Accumulated
Other
Comprehensive
Income
 
(in millions)
Balance, December 31, 2010
$
110

 
$
(8
)
 
$
10

 
$
112

Other comprehensive income (loss)
257

 
0

 
(1
)
 
256

Balance, December 31, 2011
$
367

 
$
(8
)
 
$
9

 
$
368


Year Ended Ended December 31, 2010

 
Net Unrealized
Gains (Losses) on
Investments
 
Cumulative
Translation
Adjustment
 
Cash Flow Hedge
 
Total Accumulated
Other
Comprehensive
Income
 
(in millions)
Balance, December 31, 2009
$
139

 
$
(7
)
 
$
10

 
$
142

Other comprehensive income (loss)
(29
)
 
(1
)
 
0

 
(30
)
Balance, December 31, 2010
$
110

 
$
(8
)
 
$
10

 
$
112