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Long-Term Incentive Plans (Narrative) (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2010 | Dec. 31, 2012 Y | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issued under Omnibus Plan in connection with stock options, count |  | 1 |  |  |
ISO and NQSO granted price at fair value of common stock, percentage |  | 100.00% |  |  |
Options expired or canceled |  | 461,805 | 225,874 | 1,493,873 |
Granted |  | 2,689,542 | 235,050 | 805,776 |
Fair value of restricted shares awarded |  | $ 21 | $ 2 |  |
Fair value of restricted shares cancelled |  | 2 | 1 |  |
Unearned compensation, net of estimated forfeitures |  | 20 |  |  |
Unearned compensation, net of estimated forfeitures, expected to be recognized, years |  | 2.5 |  |  |
Options granted | 1,100,000 |  |  | 1,100,000 |
Number of Options, Outstanding |  | 5,963,268 | 6,425,073 | 6,650,947 | 7,044,820
After May 1, 2012 Amendment [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issued under Omnibus Plan in connection with other than stock options, count |  | 1.28 |  |  |
Prior To May 1, 2012 Amendment [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issued under Omnibus Plan in connection with other than stock options, count |  | 2 |  |  |
Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options exercisable in years |  | 4 |  |  |
Options expire in years |  | 7 |  |  |
Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options exercisable in years |  | 5 |  |  |
Options expire in years |  | 10 |  |  |
Omnibus Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total number of shares of common stock reserved and available for issuance |  | 10,000,000 |  |  |
Shareholder approved increase in common stock reserved and available for issuance |  | 14,000,000 |  |  |
Options expired or canceled |  | 461,805 |  |  |
Restricted Share Activity [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Granted |  | 2,689,542 | 235,050 | 805,776 |
Canceled |  | 180,665 | 58,466 | 913,070 |
Shares/units available for future grants |  | 10,131,530 |  |  |
Share-based compensation expense (benefit) |  | 11 | 9 | 6 |
Tax benefit related to restricted share awards |  | 1 | 2 | 2 |
Tax charge related to restricted share awards |  |  | 1 | 1 |
Restricted Share Unit [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Granted |  | 0 |  |  |
Canceled |  | 0 |  |  |
Stock Options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense (benefit) |  | 3 | 4 | 2 |
Stock option awards exercised |  | 0 | 0 | 0 |
Deferred tax asset write off |  | 6 | 3 | 2 |
Unrecognized compensation cost |  | 2 |  |  |
Expected to be recognized as expense over a weighted average period, years |  | 1 year 4 months 24 days |  |  |
Restricted Shares [Member] | Key Employees [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Granted |  | 2,000,000 |  |  |
Performance Based Awards [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options expired or canceled |  | 12,534 |  |  |
Shares/units available for future grants |  | 118,354 |  |  |
Share-based compensation expense (benefit) |  | (3) | (2) | 5 |
Options granted |  | 0 |  |  |
Number of Options, Outstanding |  | 231,646 |  |  |
Performance Based Awards [Member] | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares/units available for future grants |  | 350,000 |  |  |
Deferred Cash Awards [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense (benefit) |  | $ 3 | $ 9 | 7 |
Deferred Cash Awards [Member] | Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Long-term incentive awards vesting period, years |  | 3 years |  |  |
Deferred Cash Awards [Member] | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Long-term incentive awards vesting period, years |  | 5 years |  |  |

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