Segment Information - Global Health Care Operating Segments (Details)	Sep. 30, 2013 States
Commercial Operating Segment [Member]
Segment Reporting Information [Line Items]
Number of States in which Entity Operates	50
Government Operating Segment [Member] | Medicare Advantage Plans [Member]
Segment Reporting Information [Line Items]
Number of States in which Entity Operates	15
Government Operating Segment [Member] | Medicare Part D Plans [Member]
Segment Reporting Information [Line Items]
Number of States in which Entity Operates	50