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Share-Based Compensation And Other Compensation Arrangements (Narrative) (Details) - USD ($)						12 Months Ended
	Dec. 14, 2020	Feb. 28, 2020	Feb. 24, 2020	Feb. 25, 2019	Feb. 26, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
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						1,860,520	2,375,583
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value						$ 90,000,000	$ 279,000,000	$ 320,000,000
Stock options exercised						36,000,000	58,000,000	81,000,000
Share-based Payment Arrangement, Exercise of Option, Tax Benefit						32,000,000	61,000,000	70,000,000
Deferred compensation						93,000,000	174,000,000	19,000,000
Deferred compensation liability which is being marked to market						1,718,000,000	1,779,000,000
Incentive Program Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost						$ 237,000,000
Restricted stock units (RSUs) granted						1,103,608
Employee Incentive Program Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost						$ 973,000,000
Restricted stock units (RSUs) granted						5,163,425
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units (RSUs) granted			325,108	233,582	260,730
Restricted stock units (RSUs) granted (fair value per share)	$ 233.00		$ 319.04	$ 428.22	$ 361.13
Restricted Stock Units (RSUs) [Member] \| Incentive Program Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units (RSUs) granted	721,734
Restricted Stock Units (RSUs) [Member] \| Employee Incentive Program Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units (RSUs) granted	5,163,425
Performance Awards [Member] \| 2020 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		3 years
Initial Value Of Performance Awards (per unit)		$ 100
Performance Awards [Member] \| 2019 performance awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				3 years
Initial Value Of Performance Awards (per unit)				$ 100
Performance Awards [Member] \| 2018PerformanceAwardMember [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)					3 years
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] \| 2020 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] \| Minimum [Member] \| 2019 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] \| 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] \| 2020 Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount payable at end of three-year performance period3		$ 150
Performance Award Payout Amount, Aggregate						$ 274,000,000
Performance Awards [Member] \| Maximum [Member] \| 2019 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 Award Payout Amount, Aggregate							$ 341,000,000
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								$ 331,000,000
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)			$ 357.38	$ 466.04	$ 390.27
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate			27.04%	23.88%	22.11%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate			1.21%	2.46%	2.36%
Performance Based Restricted Stock Units (PBRSUs) [Member] \| 2020 PBRSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units (RSUs) granted			290,202
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] \| 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] \| Minimum [Member] \| 2020 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] \| 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] \| Maximum [Member] \| 2020 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%
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%