Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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Unrecognized cost of unvested share-based compensation awards.

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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.

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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.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 20

-Section 55

-Paragraph 24

-URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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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.

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Percentage of vesting of share-based compensation awards.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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).

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The weighted average fair value at grant date for nonvested equity-based awards issued 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).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: 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.D.2)

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(i)

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Number of non-option equity instruments exercised by participants.

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- Definition

Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ 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 (c)(1)(i)

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-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(ii)

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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- Definition

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

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No definition available.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

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

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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No definition available.

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- Definition

Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

+ References

No definition available.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

+ References

No definition available.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Number of share options (or share units) exercised during the current period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28,29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(2)

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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Actual conversion rate of performance shares into common shares

+ References

No definition available.

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Expected Conversion Rate Of Common Stock Shares

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Number of Vesting Tranches Under Performance Awards Granted

+ References

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The number of shares under a share-based award plan other than a stock option plan that were settled during the reporting period due to the satisfaction of vesting conditions under the plan.

+ References

No definition available.

+ Details

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The number of non-option equity instruments that vested during the reporting period

+ References

No definition available.

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Conversion rate provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements.

+ References

No definition available.

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Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock-based Compensation Arrangements Activity
Stock-based compensation expense	$ 60us-gaap_ShareBasedCompensation	$ 64us-gaap_ShareBasedCompensation	$ 58us-gaap_ShareBasedCompensation
Tax benefit recognized on stock-based compensation expense	21	22	20
Tax benefit realized for tax deductions resulting from exercises and vestings	64	66	45
Effect of tax deductions in excess of recognized stock-based compensation expense reported as a financing cash flow	47	47	27
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding Rollforward
Stock options outstanding as of beginning of year	8,558,093
Number of stock options, granted	126,095
Number of stock options, exercised	(2,564,125)
Number of stock options, expired	(1,449,986)
Number of stock options, forfeited	(856)
Stock options outstanding as of end of year	4,669,221	8,558,093
Number of stock options, exercisable as of December 31, 2014	4,315,414
Weighted-average exercise price per share outstanding, beginning balance	$ 27.88
Weighted-average exercise price per share, granted	$ 48.57
Weighted-average exercise price per share, exercised	$ 18.64
Weighted-average exercise price per share, expired	$ 66.67
Weighted average exercise price per share, forfeited	$ 17.68
Weighted-average exercise price per share outstanding, ending balance	$ 21.48	$ 27.88
Weighted-average exercise price per share, exercisable as of December 31, 2014	$ 19.99
Weighted-average remaining contractual term, outstanding as of December 31, 2014	4 years 6 months
Weighted-average remaining contractual term, exercisable as of December 31, 2014	4 years 2 months
Aggregate intrinsic value, outstanding as of December 31, 2014	131
Aggregate intrinsic value, exercisable as of December 31, 2014	127
Nonvested Shares or Awards Other Than Options Rollforward
Shares or awards, granted	225,829
Employee Stock Option [Member]
Summary of Weighted-Average Assumptions Used in Fair Value Measurements
Expected life in years	6 years	6 years	6 years
Expected volatility	43.21%	49.63%	49.11%
Expected dividend yield	2.27%	2.27%	2.39%
Risk-free interest rate	1.74%	1.77%	0.85%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding Rollforward
Weighted average grant date fair value of stock option	$ 17.31	$ 15.83	$ 10.98
Intrinsic value of stock options exercised	85	101	78
Cash received from exercise of stock options	47	59	59
Stock Based Compensation (Textual)
Vesting period of stock-based payment awards granted	3 years
Unrecognized share-based compensation cost related to outstanding unvested awards	1
Weighted-average period of recognition for unrecognized compensation costs on nonvested awards	2 years
Employee Stock Option [Member] \| Minimum [Member]
Stock Based Compensation (Textual)
Expiration period of stock-based compensation awards	7 years
Employee Stock Option [Member] \| Maximum [Member]
Stock Based Compensation (Textual)
Expiration period of stock-based compensation awards	10 years
Restricted Stock Awards - Nonemployee [Member]
Stock Based Compensation (Textual)
Vesting period of stock-based payment awards granted	3 years
Restricted Stock [Member]
Nonvested Shares or Awards Other Than Options Rollforward
Nonvested shares or awards, beginning balance	2,205,314
Shares or awards, granted	969,671
Awards, vested	(1,402,753)
Shares or awards, forfeited	(14,082)
Nonvested shares or awards, ending balance	1,758,150	2,205,314
Nonvested Awards Other Than Options Weighted Average Grant Date Fair Value Rollforward
Weighted average grant date fair value, beginning balance	$ 32.23
Weighted average grant date fair value, granted	$ 49.40
Weighted average grant date fair value, vested	$ 31.90
Weighted average grant date fair value, forfeited	$ 32.56
Weighted average grant date fair value, ending balance	$ 41.96	$ 32.23
Stock Based Compensation (Textual)
Vesting period of stock-based payment awards granted	3 years
Unrecognized share-based compensation cost related to outstanding unvested awards	45
Weighted-average period of recognition for unrecognized compensation costs on nonvested awards	2 years
Total fair value of restricted stock vested	60	74	47
Performance Awards [Member]
Nonvested Shares or Awards Other Than Options Rollforward
Nonvested shares or awards, beginning balance	947,165
Shares or awards, granted	225,829
Awards, vested	(534,028)
Shares or awards, forfeited	(24,576)
Nonvested shares or awards, ending balance	614,390	947,165
Vested Awards Other Than Options Rollforward
Vested awards, beginning balance	0
Awards, vested	534,028
Awards, converted	(534,028)
Awards, forfeited	0
Vested awards, ending balance	0	0
Performance Awards Converted [Abstract]
Vested awards converted	534,028
Converted shares issued	866,634
Stock Based Compensation (Textual)
Vesting period of stock-based payment awards granted	1 year
Unrecognized share-based compensation cost related to outstanding unvested awards	11
Total fair value of restricted stock vested	$ 15	$ 12	$ 3
Performance award vesting rights	33.33%
Number of vesting tranches under performance awards granted	3
Performance Awards [Member] \| Award Year 2010 [Member]
Performance Awards Converted [Abstract]
Vested awards converted	201,422
Actual conversion rate of common shares	100.00%
Converted shares issued	201,422
Performance Awards [Member] \| Award Year 2011 [Member]
Performance Awards Converted [Abstract]
Vested awards converted	227,571
Actual conversion rate of common shares	200.00%
Converted shares issued	455,142
Performance Awards [Member] \| Award Year 2012 [Member]
Performance Awards Converted [Abstract]
Vested awards converted	102,855
Actual conversion rate of common shares	200.00%
Converted shares issued	205,710
Performance Awards [Member] \| Award Year 2012 [Member] \| Share-based Compensation Award, Tranche Three [Member]
Nonvested Shares or Awards Other Than Options Rollforward
Shares or awards, granted	99,023
Nonvested Awards Other Than Options Weighted Average Grant Date Fair Value Rollforward
Weighted average grant date fair value, granted	$ 47.47
Expected conversion rate of common stock shares	1.00
Performance Awards [Member] \| Award Year 2013 [Member]
Performance Awards Converted [Abstract]
Vested awards converted	2,180
Actual conversion rate of common shares	200.00%
Converted shares issued	4,360
Performance Awards [Member] \| Award Year 2013 [Member] \| Share-based Compensation Award, Tranche Two [Member]
Nonvested Shares or Awards Other Than Options Rollforward
Shares or awards, granted	76,232
Nonvested Awards Other Than Options Weighted Average Grant Date Fair Value Rollforward
Weighted average grant date fair value, granted	$ 47.47
Expected conversion rate of common stock shares	1.00
Performance Awards [Member] \| Award Year 2014 [Member] \| Share-based Compensation Award, Tranche One [Member]
Nonvested Shares or Awards Other Than Options Rollforward
Shares or awards, granted	50,574
Nonvested Awards Other Than Options Weighted Average Grant Date Fair Value Rollforward
Weighted average grant date fair value, granted	$ 48.57
Expected conversion rate of common stock shares	1.00
Performance Awards [Member] \| Minimum [Member]
Stock Based Compensation (Textual)
Performance awards range of conversion rates	0.00%
Performance Awards [Member] \| Maximum [Member]
Stock Based Compensation (Textual)
Performance awards range of conversion rates	200.00%
Omnibus Stock Incentive Plan [Member] \| Stock Compensation Plan [Member]
Stock Based Compensation (Textual)
Number of shares of common stock available to be awarded under stock-based compensation plans	13,536,081
Formerly Maintained Plans [Member] \| Stock Compensation Plan [Member]
Stock Based Compensation (Textual)
Number of shares of common stock available to be awarded under stock-based compensation plans	0