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Income Taxes - Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2013
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Dec. 31, 2012
|
Dec. 31, 2011
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| Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits | |||
| Unrecognized tax benefit - opening balance | $ 23 | $ 25 | $ 57 |
| Gross increases - tax positions in prior periods | 8 | 6 | |
| Gross decreases - tax positions in prior periods | (5) | (6) | (3) |
| Gross increases - tax positions in current period | 1 | 6 | |
| Decrease related to lapsing of statute of limitations | (2) | (2) | |
| Decrease due to disposals | (32) | ||
| Settlements | (1) | (3) | |
| Unrecognized tax benefit - ending balance | $ 24 | $ 23 | $ 25 |