Share-Based Compensation Plans (Share Options Outstanding) (Details) (USD $)	12 Months Ended
Dec. 31, 2011
Options Outstanding [Member]
Options Outstanding - Number Outstanding at 12/31/11	2,316,276
Options Outstanding - Weighted-Average Remaining Contractual Life	6.0
Options Outstanding - Weighted- Average Exercise Price	$ 84.39
Options Exercisable [Member]
Options Exercisable, Number at 12/31/11	1,229,481
Options Exercisable - Weighted- Average Exercise Price	$ 84.94
Exercise Prices Range One [Member]
Exercise Prices - Lower Range Limit	$ 53.1375
Exercise Prices - Upper Range Limit	$ 63.7650
Exercise Prices Range One [Member] \| Options Outstanding [Member]
Options Outstanding - Number Outstanding at 12/31/11	93,450
Options Outstanding - Weighted-Average Remaining Contractual Life	0.7
Options Outstanding - Weighted- Average Exercise Price	$ 55.60
Exercise Prices Range One [Member] \| Options Exercisable [Member]
Options Exercisable, Number at 12/31/11	93,450
Options Exercisable - Weighted- Average Exercise Price	$ 55.60
Exercise Prices Range Two [Member]
Exercise Prices - Lower Range Limit	$ 63.7651
Exercise Prices - Upper Range Limit	$ 74.3925
Exercise Prices Range Two [Member] \| Options Outstanding [Member]
Options Outstanding - Number Outstanding at 12/31/11	765,036
Options Outstanding - Weighted-Average Remaining Contractual Life	5.4
Options Outstanding - Weighted- Average Exercise Price	$ 72.54
Exercise Prices Range Two [Member] \| Options Exercisable [Member]
Options Exercisable, Number at 12/31/11	445,896
Options Exercisable - Weighted- Average Exercise Price	$ 73.14
Exercise Prices Range Three [Member]
Exercise Prices - Lower Range Limit	$ 74.3926
Exercise Prices - Upper Range Limit	$ 85.0200
Exercise Prices Range Three [Member] \| Options Outstanding [Member]
Options Outstanding - Number Outstanding at 12/31/11	334,990
Options Outstanding - Weighted-Average Remaining Contractual Life	8.1
Options Outstanding - Weighted- Average Exercise Price	$ 84.63
Exercise Prices Range Three [Member] \| Options Exercisable [Member]
Options Exercisable, Number at 12/31/11	69,095
Options Exercisable - Weighted- Average Exercise Price	$ 84.63
Exercise Prices Range Four [Member]
Exercise Prices - Lower Range Limit	$ 85.0201
Exercise Prices - Upper Range Limit	$ 95.6475
Exercise Prices Range Four [Member] \| Options Outstanding [Member]
Options Outstanding - Number Outstanding at 12/31/11	547,850
Options Outstanding - Weighted-Average Remaining Contractual Life	7.0
Options Outstanding - Weighted- Average Exercise Price	$ 89.98
Exercise Prices Range Four [Member] \| Options Exercisable [Member]
Options Exercisable, Number at 12/31/11	214,550
Options Exercisable - Weighted- Average Exercise Price	$ 95.13
Exercise Prices Range Five [Member]
Exercise Prices - Lower Range Limit	$ 95.6476
Exercise Prices - Upper Range Limit	$ 106.2750
Exercise Prices Range Five [Member] \| Options Outstanding [Member]
Options Outstanding - Number Outstanding at 12/31/11	574,950
Options Outstanding - Weighted-Average Remaining Contractual Life	5.6
Options Outstanding - Weighted- Average Exercise Price	$ 99.36
Exercise Prices Range Five [Member] \| Options Exercisable [Member]
Options Exercisable, Number at 12/31/11	406,490
Options Exercisable - Weighted- Average Exercise Price	$ 99.30

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.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(c)

-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 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

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

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including 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

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

-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 b(1)(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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(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 4: 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

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(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 2: 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)

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

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-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 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

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

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(c)

-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 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(iii)

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

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The weighted-average period remaining as of the balance sheet date until option expiration pertaining to the outstanding stock options for all option plans in the customized range of exercise prices, which may be expressed in a variety of ways (for example, years, months).

+ References

+ Details

Name:	us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration