|
Commitments And Contingencies (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified |
6 Months Ended |
|---|---|
|
Jun. 30, 2012
|
|
| Long-term Purchase Commitment [Line Items] | |
| Estimated term for resolution for legal matters related to indemnification | 3 years |
| Fair value of the indemnification obligation | $ 385 |
| Fair value of the indemnification obligation | 256 |
| Estimated aggregate amount of losses reasonably to be incurred in excess of amounts | 200 |
|
Carrying Amount [Member]
|
|
| Long-term Purchase Commitment [Line Items] | |
| Indemnification obligation | 383 |
|
Fair Value Inputs Total [Member]
|
|
| Long-term Purchase Commitment [Line Items] | |
| Indemnification obligation | 383 |
|
Morgan Keegan [Member]
|
|
| Long-term Purchase Commitment [Line Items] | |
| Fair value of the indemnification obligation | $ 256 |