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

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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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Share-Based Compensation And Other Compensation Arrangements (Narrative) (Details) - USD ($)				1 Months Ended		12 Months Ended
	Feb. 27, 2017	Feb. 22, 2016	Feb. 23, 2015	Feb. 29, 2016	Feb. 28, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Feb. 28, 2017	Feb. 28, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate number of shares of stock available for issuance						87,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period						4,417,218	8,646,612
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value						$ 491,000,000	$ 265,000,000	$ 385,000,000
Stock options exercised						311,000,000	321,000,000	399,000,000
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options						175,000,000	94,000,000	135,000,000
Grant date fair value of stock options vested						0	27,000,000	56,000,000
Deferred compensation						240,000,000	46,000,000	63,000,000
Deferred compensation liability which is being marked to market						$ 1,547,000,000	1,289,000,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award options expiration term (in years)						10 years
Award vesting period (in years)						3 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units (RSUs) granted	523,835			777,837	590,778
Restricted stock units (RSUs) granted (fair value per share)	$ 178.72			$ 117.50	$ 154.64
Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	3 years
Performance Awards [Member] \| 2016 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Initial Value Of Performance Awards (per unit)	$ 100
Performance Awards [Member] \| 2015 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				3 years
Performance Awards [Member] \| 2014 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)					3 years
Performance Awards [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance Award Payout Amount, Aggregate						$ 0
Performance Awards [Member] \| Minimum [Member] \| 2016 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount payable at end of three-year performance period3	0
Performance Awards [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount payable at end of three-year performance period3				$ 200	$ 200
Performance Award Payout Amount, Aggregate						$ 352,000,000
Performance Awards [Member] \| Maximum [Member] \| 2016 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount payable at end of three-year performance period3	$ 200
Performance Awards [Member] \| Maximum [Member] \| 2015 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance Award Payout Amount, Aggregate							$ 318,000,000
Performance Awards [Member] \| Maximum [Member] \| 2014 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance Award Payout Amount, Aggregate								$ 312,000,000
Performance Based Restricted Stock Units (PBRSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	3 years	3 years	3 years
Restricted stock units (RSUs) granted	492,273	721,176	556,203
Restricted stock units (RSUs) granted (fair value per share)	$ 190.17	$ 126.74	$ 164.26
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	21.37%	22.44%	20.35%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	1.46%	0.92%	1.03%
Performance Based Restricted Stock Units (PBRSUs) [Member] \| 2016 PBRSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Initial PBRSU value, percentage of value it cannot exceed									400.00%
Performance Based Restricted Stock Units (PBRSUs) [Member] \| 2015 PBRSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Initial PBRSU value, percentage of value it cannot exceed										400.00%
Performance Based Restricted Stock Units (PBRSUs) [Member] \| 2014 PBRSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Initial PBRSU value, percentage of value it cannot exceed			400.00%
Performance Based Restricted Stock Units (PBRSUs) [Member] \| Minimum [Member] \| 2016 PBRSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Payout Range									0.00%
Performance Based Restricted Stock Units (PBRSUs) [Member] \| Minimum [Member] \| 2015 PBRSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Payout Range										0.00%
Performance Based Restricted Stock Units (PBRSUs) [Member] \| Minimum [Member] \| 2014 PBRSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Payout Range			0.00%
Performance Based Restricted Stock Units (PBRSUs) [Member] \| Maximum [Member] \| 2016 PBRSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Payout Range									200.00%
Performance Based Restricted Stock Units (PBRSUs) [Member] \| Maximum [Member] \| 2015 PBRSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Payout Range										200.00%
Performance Based Restricted Stock Units (PBRSUs) [Member] \| Maximum [Member] \| 2014 PBRSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Payout Range			200.00%