|
Discontinued Operations - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
4 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
|
May 05, 2011
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
|
| Discontinued Operations And Disposal Groups [Abstract] | ||||
| Gain from disposal of discontinued operations, net of tax | $ 312 | $ 4 | $ 7 | $ 312 |
| Gain realized on settlement of obligation | $ 4 | $ 7 | ||