|
Changes In Carrying Amount Of Goodwill By Reportable Segments (Detail) (USD $)
In Millions, unless otherwise specified |
6 Months Ended |
|---|---|
|
Jun. 30, 2012
|
|
| Goodwill [Line Items] | |
| Balance at January 1, 2012 | $ 2,740 |
| Acquisitions | 52 |
| Balance at June 30, 2012 | 2,792 |
|
Retail
|
|
| Goodwill [Line Items] | |
| Balance at January 1, 2012 | 754 |
| Acquisitions | 43 |
| Balance at June 30, 2012 | 797 |
|
Employer Group
|
|
| Goodwill [Line Items] | |
| Balance at January 1, 2012 | 62 |
| Acquisitions | 0 |
| Balance at June 30, 2012 | 62 |
|
Health And Well-Being Services
|
|
| Goodwill [Line Items] | |
| Balance at January 1, 2012 | 1,867 |
| Acquisitions | 9 |
| Balance at June 30, 2012 | 1,876 |
|
Other Businesses
|
|
| Goodwill [Line Items] | |
| Balance at January 1, 2012 | 57 |
| Acquisitions | 0 |
| Balance at June 30, 2012 | $ 57 |