Stock Benefit Plans (Summary Of The Status Of Restricted Stock Unit And Performance Unit Awards) (Details) - $ / shares	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restricted Stock Units (RSUs)
Restricted Stock Units and Performance Stock Units [Roll Forward]
Non-vested balance at January 1, 2018 (in shares)	4,052,747
Granted (in shares)	2,390,859
Vested (in shares)	(1,796,343)
Forfeited (in shares)	(317,032)
Non-vested balance at December 31, 2018 (in shares)	4,330,231	4,052,747
Weighted Average Grant Date Fair Value [Roll Forward]
Non-vested balance at January 1, 2018 (in dollars per share)	$ 66.97
Granted (in dollars per share)	83.05	$ 73.23	$ 57.54
Vested (in dollars per share)	64.22
Forfeited (in dollars per share)	73.81
Non-vested balance at December 31, 2018 (in dollars per share)	$ 76.49	$ 66.97
Performance Shares
Restricted Stock Units and Performance Stock Units [Roll Forward]
Non-vested balance at January 1, 2018 (in shares)	690,601
Granted (in shares)	225,736
Vested (in shares)	(173,978)
Forfeited (in shares)	(43,561)
Non-vested balance at December 31, 2018 (in shares)	698,798	690,601
Weighted Average Grant Date Fair Value [Roll Forward]
Non-vested balance at January 1, 2018 (in dollars per share)	$ 62.82
Granted (in dollars per share)	83.05	$ 73.20	$ 57.47
Vested (in dollars per share)	57.33
Forfeited (in dollars per share)	69.20
Non-vested balance at December 31, 2018 (in dollars per share)	$ 70.33	$ 62.82

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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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-Name Accounting Standards Codification
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-Paragraph 2
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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).

+ References

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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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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