|
Stockholders' Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified |
3 Months Ended | 6 Months Ended | |||||
|---|---|---|---|---|---|---|---|
|
Mar. 31, 2012
|
Jun. 30, 2011
|
Mar. 31, 2011
|
Jun. 30, 2012
|
Jun. 30, 2011
|
Dec. 31, 2009
2009 Long Term Incentive Plan [Member]
|
Jun. 30, 2012
2009 Plan Amendment [Member]
|
|
| Schedule of Capitalization, Equity [Line Items] | |||||||
| Plan expiration date | Jun. 02, 2019 | ||||||
| Shares authorized for issuance | 21,500,000 | 47,000,000 | |||||
| Calculated shares issued subsequent to plan amendment, other awards | 2.38 | ||||||
| Dividends paid on common stock | $ 162 | $ 140 | |||||
| Dividends paid on common stock, per share | $ 0.20 | $ 0.17 | $ 0.16 | ||||