Stock Compensation - Exercise Price Range (Details) - Employee Stock Option - Long-term incentive and director compensation plans - $ / shares	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Minimum	$ 14.47
Exercise Price Range, Maximum	$ 97.29
Number Outstanding (Shares)	44,754,593	52,265,788
Weighted Average Remaining Contractual Life (Years)	6 years 4 months 24 days
Options Outstanding Weighted Average Exercise Price per Share	$ 48.49	$ 41.89
Number Exercisable (Shares)	22,114,114
Options Exercisable Weighted Average Exercise Price per Share	$ 37.34
Range Of Exercise Prices $14.47 to $20.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Minimum	14.47
Exercise Price Range, Maximum	$ 20.00
Number Outstanding (Shares)	1,230,810
Weighted Average Remaining Contractual Life (Years)	1 year 1 month 6 days
Options Outstanding Weighted Average Exercise Price per Share	$ 14.97
Number Exercisable (Shares)	1,230,810
Options Exercisable Weighted Average Exercise Price per Share	$ 14.97
Range Of Exercise Prices $20.01 to $30.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Minimum	20.01
Exercise Price Range, Maximum	$ 30.00
Number Outstanding (Shares)	2,559,613
Weighted Average Remaining Contractual Life (Years)	1 year 10 months 24 days
Options Outstanding Weighted Average Exercise Price per Share	$ 23.86
Number Exercisable (Shares)	2,559,613
Options Exercisable Weighted Average Exercise Price per Share	$ 23.86
Range Of Exercise Prices $30.01 to $40.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Minimum	30.01
Exercise Price Range, Maximum	$ 40.00
Number Outstanding (Shares)	9,441,380
Weighted Average Remaining Contractual Life (Years)	4 years 3 months 18 days
Options Outstanding Weighted Average Exercise Price per Share	$ 33.02
Number Exercisable (Shares)	9,441,380
Options Exercisable Weighted Average Exercise Price per Share	$ 33.02
Range Of Exercise Prices $40.01 to $50.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Minimum	40.01
Exercise Price Range, Maximum	$ 50.00
Number Outstanding (Shares)	7,466,229
Weighted Average Remaining Contractual Life (Years)	6 years 1 month 6 days
Options Outstanding Weighted Average Exercise Price per Share	$ 44.10
Number Exercisable (Shares)	4,403,409
Options Exercisable Weighted Average Exercise Price per Share	$ 44.10
Range Of Exercise Prices $50.01 to $60.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Minimum	50.01
Exercise Price Range, Maximum	$ 60.00
Number Outstanding (Shares)	17,689,385
Weighted Average Remaining Contractual Life (Years)	7 years 7 months 6 days
Options Outstanding Weighted Average Exercise Price per Share	$ 53.42
Number Exercisable (Shares)	4,472,432
Options Exercisable Weighted Average Exercise Price per Share	$ 53.61
Range Of Exercise Prices $60.01 to 70.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Minimum	60.01
Exercise Price Range, Maximum	$ 70.00
Number Outstanding (Shares)	0
Weighted Average Remaining Contractual Life (Years)	0 years
Options Outstanding Weighted Average Exercise Price per Share	$ 0
Number Exercisable (Shares)	0
Options Exercisable Weighted Average Exercise Price per Share	$ 0
Range Of Exercise Prices $70.01 to 80.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Minimum	70.01
Exercise Price Range, Maximum	$ 80.00
Number Outstanding (Shares)	6,347,174
Weighted Average Remaining Contractual Life (Years)	9 years 1 month 6 days
Options Outstanding Weighted Average Exercise Price per Share	$ 79.19
Number Exercisable (Shares)	6,470
Options Exercisable Weighted Average Exercise Price per Share	$ 71.03
Range Of Exercise Prices $80.01 to 97.29
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Minimum	80.01
Exercise Price Range, Maximum	$ 97.29
Number Outstanding (Shares)	20,002
Weighted Average Remaining Contractual Life (Years)	9 years 8 months 12 days
Options Outstanding Weighted Average Exercise Price per Share	$ 88.81
Number Exercisable (Shares)	0
Options Exercisable Weighted Average Exercise Price per Share	$ 0

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

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=96867065&loc=d3e5070-113901

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)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Weighted average price 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 Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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 Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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 Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ 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)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term of outstanding stock options, 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
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