Cumulative Expense on Options

No definition available.

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- Definition

Option Tranches Expiry Period

+ References

No definition available.

+ Details

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- Definition

Percentage Of Awards Becoming Exercisable In One Year

+ References

No definition available.

+ Details

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- Definition

Restricted Stock Units Share Based Compensation Awards Number Vested

+ References

No definition available.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Percentage

+ References

No definition available.

+ Details

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- Details

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph g(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

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- Definition

Aggregate unrecognized cost of share-based awards, other than options, made to employees under an equity-based compensation plan, that have yet to vest.

+ References

No definition available.

+ Details

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Balance Type:	debit
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- Definition

Aggregate unrecognized cost of option awards made to employees under a stock option plan or plans, that have yet to vest.

+ References

No definition available.

+ Details

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

+ Details

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph i

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 19

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 18

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

+ Details

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

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- Definition

The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

+ References

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

+ Details

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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

+ References

No definition available.

+ Details

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

+ References

No definition available.

+ Details

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Stock-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock Based Compensation [Line Items]
Vesting rate	75.00%
Vesting rate	25.00%
Tranches expire period	10 years
Stock-based compensation expense	$ 33	$ 26	$ 18
Tax benefit related to stock compensation expense	13	11	8
Stock options granted exercise prices	$ 28.00	$ 30.00	$ 18.76
Weighted-average grant date fair value of options granted	$ 7.25	$ 9.39	$ 8.05
Aggregate fair value of options vested	21	12	12
Intrinsic value of options exercised	34	18	4
Cash proceeds from exercise of options	32
Centerview Partners [Member]
Stock Based Compensation [Line Items]
Cumulative expense related to outstanding options	5
Stock Incentive Plan [Member]
Stock Based Compensation [Line Items]
Number of shares authorized for award of options	34,795,000
Time-based stock options [Member]
Stock Based Compensation [Line Items]
Stock options granted exercise prices			$ 18.41
Time-based stock options [Member] \| Centerview Partners [Member]
Stock Based Compensation [Line Items]
Stock options granted	218,750
Time-based stock options [Member] \| Stock Incentive Plan [Member]
Stock Based Compensation [Line Items]
Stock options granted	4,133,381	4,307,002
Time-based stock options [Member] \| Equity Participation Plan [Member]
Stock Based Compensation [Line Items]
Stock options granted			919,052
Performance-based stock options [Member]
Stock Based Compensation [Line Items]
Stock options granted exercise prices			$ 36.80
Performance-based stock options [Member] \| Centerview Partners [Member]
Stock Based Compensation [Line Items]
Stock options granted	312,500
Performance-based stock options [Member] \| Equity Participation Plan [Member]
Stock Based Compensation [Line Items]
Stock options granted			175,301
2011 Time-based awards [Member]
Stock Based Compensation [Line Items]
Vesting period	4 years
Vesting rate	25.00%
2010 Performance Based Stock Options [Member]
Stock Based Compensation [Line Items]
Vesting period			4 years
2009 Time-based awards [Member]
Stock Based Compensation [Line Items]
Vesting period	4 years
2008 Time-based awards [Member]
Stock Based Compensation [Line Items]
Vesting period	4 years
2007 Time-based awards [Member]
Stock Based Compensation [Line Items]
Vesting period	5 years
Stock options [Member]
Stock Based Compensation [Line Items]
Unearned stock-based compensation related to stock options	36
Unearned stock-based compensation, expected period to recognize	4 years
Restricted stock units (RSUs) [Member]
Stock Based Compensation [Line Items]
Vesting period	4 years
Vesting rate	25.00%
Unearned stock-based compensation, expected period to recognize	3 years 4 months 24 days
Estimated weighted average grant date fair value of restricted stock units	$ 27.99	$ 30.05	$ 19.20
Restricted stock units Vested	80,981
Unearned stock-based compensation of RSUs	$ 16
Restricted stock units (RSUs) [Member] \| Stock Incentive Plan [Member]
Stock Based Compensation [Line Items]
Restricted stock units granted	687,300	248,450	6,250