|
Equity-Based Compensation Information Related to Restricted Stock Units (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2012
|
Dec. 31, 2011
|
Dec. 31, 2010
|
|
| Information Related to RSU's [Line Items] | |||
| Pretax expense for RSU's | $ 46 | $ 50 | $ 39 |
| After-tax expense for RSU's | $ 30 | $ 32 | $ 25 |