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

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Share-Based Compensation And Other Compensation Arrangements (Narrative) (Details) - USD ($)			1 Months Ended			12 Months Ended
	Feb. 25, 2019	Feb. 26, 2018	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2017	Dec. 31, 2019	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						2,375,583	3,252,083
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value						$ 279,000,000	$ 320,000,000	$ 491,000,000
Stock options exercised						58,000,000	81,000,000	311,000,000
Share-based Payment Arrangement, Exercise of Option, Tax Benefit						61,000,000	70,000,000	175,000,000
Deferred compensation						174,000,000	19,000,000	$ 240,000,000
Deferred compensation liability which is being marked to market						1,779,000,000	1,572,000,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units (RSUs) granted			233,582	260,730	523,835
Restricted stock units (RSUs) granted (fair value per share)			$ 428.22	$ 361.13	$ 178.72
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] \| 2018PerformanceAwardMember [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Initial Value Of Performance Awards (per unit)		$ 100
Performance Awards [Member] \| 2018 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] \| 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] \| 2017 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance Award Payout Amount, Aggregate									$ 325,000,000
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 Award Payout Amount, Aggregate							$ 355,000,000
Performance Awards [Member] \| Maximum [Member] \| 2019 performance awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance Award Payout Amount, Aggregate						$ 392,000,000
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)			$ 466.04	$ 390.27	$ 190.17
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate			23.88%	22.11%	21.37%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate			2.46%	2.36%	1.46%
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
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] \| 2019 PBRSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units (RSUs) granted			214,651
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] \| 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] \| 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] \| Minimum [Member] \| 2019 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] \| 2017 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] \| 2019 PBRSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Payout Range	200.00%