|
Stockholders Equity - Additional Information (Detail) (USD $)
Share data in Millions, unless otherwise specified |
3 Months Ended | 1 Months Ended | |
|---|---|---|---|
|
Mar. 31, 2013
|
Dec. 31, 2012
|
Jan. 31, 2010
Share Repurchase Program, 2010
|
|
| Stockholders Equity Note [Line Items] | |||
| Repurchase program authorized by Board of Directors | $ 2,000,000,000 | ||
| Repurchase program authorized, remaining common stock | 763,000,000 | ||
| Common shares outstanding plus shares underlying outstanding stock awards, including all stock-based awards outstanding, including estimated forfeiture | 471 | 470 | |
| Net unrecognized compensation cost related to unvested stock-based compensation arrangements | $ 1,300,000,000 | ||
| Net unrecognized compensation cost related to unvested stock-based compensation arrangements, weighted average recognition period (in years) | 1 year 2 months 12 days |