Equity-Based Compensation (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 months years	Jun. 30, 2010 years
Equity Based Compensation, Compensation Expense [Abstract]
Restricted stock units and performance stock units	$ 33	$ 25	$ 102	$ 82
Stock options	12	13	45	46
Total impact on operating income	45	38	147	128
Tax benefit recognized	15	15	53	49
Equity Based Compensation Numeric [Abstract]
Employee service share-based compensation, unrecognized compensation costs on nonvested awards (RSU's and target PSU's)			234
Employee service share-based compensation, unrecognized compensation costs on nonvested awards, weighted average period of recognition (RSU's and target PSU's), min (in years)			1
Employee service share-based compensation, unrecognized compensation costs on nonvested awards, weighted average period of recognition (RSU's and target PSU's), max (in years)			2
Employee service share-based compensation, unrecognized compensation costs on nonvested awards (stock options)			$ 91
Employee service share-based compensation, unrecognized compensation costs on nonvested awards, weighted average period of recognition (stock options), min (in years)			1
Employee service share-based compensation, unrecognized compensation costs on nonvested awards, weighted average period of recognition (stock options), max (in years)			2
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected volatility			29.50%	29.50%
Expected term to exercise from grant date, in years			6.31	6.51
Risk-free rate			2.80%	2.90%
Expected dividend yield			2.60%	3.20%
Restricted Stock Unit
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, grants in period			5.0	5.0
Share-based compensation arrangement by share-based payment award, grants in period, weighted average grant date fair value			$ 36.09	$ 27.04
Performance Stock Unit
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, grants in period			0.1	0.2
Share-based compensation arrangement by share-based payment award, grants in period, weighted average grant date fair value			$ 45.89	$ 30.65
Stock Option
Share-based Compensation Arrangements by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, grants in period			8.0	10.0
Share-based compensation arrangement by share-based payment award, grants in period, weighted average grant date fair value			$ 9.02	$ 6.35

As of the latest balance-sheet date presented, the total compensation cost not yet recognized (will be charged against earnings as services are performed or other vesting criteria are met) related to unvested RSU's and target PSU's.

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The maximum weighted average period over which unrecognized share-based compensation costs related to unvested RSU's and target PSU's are expected to be reported.

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The minimum weighted average period over which unrecognized share-based compensation costs related to unvested RSU's and target PSU's are expected to be reported.

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The maximum weighted average period over which unrecognized share-based compensation costs related to unvested stock options are expected to be reported.

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The minimum weighted average period over which unrecognized share-based compensation costs related to unvested stock options are expected to be reported.

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Equity Based Compensation, Compensation Expense abstract

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Equity Based Compensation Numeric abstract

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Represents the expense recognized during the period arising from restricted stock units and performance stock units compensation arrangements.

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The quantity of equity based awards granted under the plan during the reporting period.

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

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Represents the expense recognized during the period arising from stock options.

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Represents the expense recognized during the period arising from share-based compensation arrangements (for example, shares of stock, 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 Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64
-Subparagraph b

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)

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph g(1)

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph e(2)(c)

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The period of time a share-based award is expected to be outstanding. A share-based award's expected term shall be determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior. An entity is required to aggregate individual awards into relatively homogeneous groups.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph e(2)(a)

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section D
-Subsection 2

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The estimated measure of the percentage amount 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph e(2)(b)

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph e(2)(d)

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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