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Share-Based Compensation And Other Compensation Arrangements (Narrative) (Details) - USD ($)				1 Months Ended			12 Months Ended
	Feb. 26, 2018	Feb. 27, 2017	Feb. 22, 2016	Feb. 28, 2018	Feb. 28, 2017	Feb. 29, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 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							3,252,083	4,417,218
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value							$ 320,000,000	$ 491,000,000	$ 265,000,000
Stock options exercised							81,000,000	311,000,000	321,000,000
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options							70,000,000	175,000,000	94,000,000
Grant date fair value of stock options vested									27,000,000
Deferred compensation							19,000,000	240,000,000	46,000,000
Deferred compensation liability which is being marked to market							1,572,000,000	1,547,000,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units (RSUs) granted				260,730	523,835	777,837
Restricted stock units (RSUs) granted (fair value per share)	$ 361.13	$ 178.72	$ 117.50
Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	3 years
Performance Awards [Member] \| 2017 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]
Award vesting period (in years)						3 years
Performance Awards [Member] \| 2018PerformanceAwardMember [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Initial Value Of Performance Awards (per unit)	$ 100
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] \| 2018PerformanceAwardMember [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 Awards [Member] \| Maximum [Member] \| 2016 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance Award Payout Amount, Aggregate									$ 310,000,000
Performance Awards [Member] \| Maximum [Member] \| 2018PerformanceAwardMember [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] \| 2018 performance awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance Award Payout Amount, Aggregate							$ 369,000,000
Performance Awards [Member] \| Maximum [Member] \| 2017PerformanceAward [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance Award Payout Amount, Aggregate								$ 332,000,000
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 (fair value per share)	$ 390.27	$ 190.17	$ 126.74
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	22.11%	21.37%	22.44%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	2.36%	1.46%	0.92%
Performance Based Restricted Stock Units (PBRSUs) [Member] \| 2018 PBRSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units (RSUs) granted	241,284
Performance Based Restricted Stock Units (PBRSUs) [Member] \| 2016 PBRSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units (RSUs) granted			721,176
Initial PBRSU value, percentage of value it cannot exceed					400.00%
Performance Based Restricted Stock Units (PBRSUs) [Member] \| 2017 PBRSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units (RSUs) granted		492,273
Initial PBRSU value, percentage of value it cannot exceed	400.00%
Performance Based Restricted Stock Units (PBRSUs) [Member] \| Minimum [Member] \| 2018 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] \| 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] \| 2017 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] \| 2018 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] \| 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] \| 2017 PBRSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Payout Range	200.00%