Financing (Components Of Debt) (Table) (Details) € in Millions, SFr in Millions, $ in Millions, ¥ in Billions	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)	Dec. 31, 2020 JPY (¥)	Dec. 31, 2020 CHF (SFr)	Oct. 06, 2020 USD ($)	Apr. 08, 2020 EUR (€)	Mar. 30, 2020 EUR (€)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 JPY (¥)	Dec. 31, 2019 CHF (SFr)	Dec. 31, 2001 USD ($)
Debt Instrument [Line Items]
Total debt	$ 21,204							$ 21,729
Less: currently payable	11							212
Long-term debt	21,193							21,517
Senior notes
Debt Instrument [Line Items]
Debt instrument, face amount	1,000
Euro-denominated commercial paper | Commercial paper
Debt Instrument [Line Items]
Total debt	611	€ 500						5,146	€ 4,600
Zero-coupon LYONS due 2021 | Convertible debt
Debt Instrument [Line Items]
Total debt	$ 24							34
Interest rate of debt instrument	0.00%	0.00%	0.00%	0.00%								2.375%
Debt instrument, face amount												$ 830
0.352% senior unsecured notes due 2021 | Senior notes
Debt Instrument [Line Items]
Total debt	$ 290							$ 276
Interest rate of debt instrument	0.352%	0.352%	0.352%	0.352%				0.352%	0.352%	0.352%	0.352%
Debt instrument, face amount | ¥			¥ 30.0							¥ 30.0
1.7% senior unsecured notes due 2022 | Senior notes
Debt Instrument [Line Items]
Total debt	$ 0							$ 895
Interest rate of debt instrument	1.70%	1.70%	1.70%	1.70%				1.70%	1.70%	1.70%	1.70%
Debt instrument, face amount | €									€ 800
Floating rate senior unsecured notes due 2022 | Senior notes
Debt Instrument [Line Items]
Total debt	$ 305							$ 280
Debt instrument, face amount | €		€ 250							€ 250
2.05% senior unsecured notes due 2022 | Senior notes
Debt Instrument [Line Items]
Total debt	$ 698							$ 697
Interest rate of debt instrument	2.05%	2.05%	2.05%	2.05%				2.05%	2.05%	2.05%	2.05%
0.5% senior unsecured bonds due 2023 | Bonds
Debt Instrument [Line Items]
Total debt	$ 611							$ 559
Interest rate of debt instrument	0.50%	0.50%	0.50%	0.50%				0.50%	0.50%	0.50%	0.50%
Debt instrument, face amount | SFr				SFr 540							SFr 540
1.7% senior notes due 2024 | Senior notes
Debt Instrument [Line Items]
Total debt	$ 1,096							$ 0
Interest rate of debt instrument	1.70%	1.70%	1.70%	1.70%		1.70%	1.70%
Debt instrument, face amount | €		€ 900				€ 150	€ 750
2.2% senior unsecured notes due 2024 | Senior notes
Debt Instrument [Line Items]
Total debt	$ 697							$ 696
Interest rate of debt instrument	2.20%	2.20%	2.20%	2.20%				2.20%	2.20%	2.20%	2.20%
2.5% senior unsecured notes due 2025 | Senior notes
Debt Instrument [Line Items]
Total debt	$ 975							$ 894
Interest rate of debt instrument	2.50%	2.50%	2.50%	2.50%				2.50%	2.50%	2.50%	2.50%
Debt instrument, face amount | €		€ 800							€ 800
3.35% senior unsecured notes due 2025 | Senior notes
Debt Instrument [Line Items]
Total debt	$ 498							$ 497
Interest rate of debt instrument	3.35%	3.35%	3.35%	3.35%				3.35%	3.35%	3.35%	3.35%
0.2% senior unsecured notes due 2026 | Senior notes
Debt Instrument [Line Items]
Total debt	$ 1,520							$ 1,392
Interest rate of debt instrument	0.20%	0.20%	0.20%	0.20%				0.20%	0.20%	0.20%	0.20%
Debt instrument, face amount | €		€ 1,300							€ 1,300
2.1% senior notes due 2026 | Senior notes
Debt Instrument [Line Items]
Total debt	$ 975							$ 0
Interest rate of debt instrument	2.10%	2.10%	2.10%	2.10%		2.10%	2.10%
Debt instrument, face amount | €		€ 800				€ 300	€ 500
0.3% senior unsecured notes due 2027 | Senior notes
Debt Instrument [Line Items]
Total debt	$ 297							$ 283
Interest rate of debt instrument	0.30%	0.30%	0.30%	0.30%				0.30%	0.30%	0.30%	0.30%
Debt instrument, face amount | ¥			¥ 30.8							¥ 30.8
1.2% senior unsecured notes due 2027 | Senior notes
Debt Instrument [Line Items]
Total debt	$ 729							$ 668
Interest rate of debt instrument	1.20%	1.20%	1.20%	1.20%				1.20%	1.20%	1.20%	1.20%
Debt instrument, face amount | €		€ 600							€ 600
0.45% senior unsecured notes due 2028 | Senior notes
Debt Instrument [Line Items]
Total debt	$ 1,518							$ 1,390
Interest rate of debt instrument	0.45%	0.45%	0.45%	0.45%				0.45%	0.45%	0.45%	0.45%
Debt instrument, face amount | €		€ 1,300							€ 1,300
1.125% senior unsecured bonds due 2028 | Bonds
Debt Instrument [Line Items]
Total debt	$ 241							$ 221
Interest rate of debt instrument	1.125%	1.125%	1.125%	1.125%				1.125%	1.125%	1.125%	1.125%
Debt instrument, face amount | SFr				SFr 210							SFr 210
2.6% senior unsecured notes due 2029 | Senior notes
Debt Instrument [Line Items]
Total debt	$ 795							$ 795
Interest rate of debt instrument	2.60%	2.60%	2.60%	2.60%				2.60%	2.60%	2.60%	2.60%
2.5% senior notes due 2030 | Senior notes
Debt Instrument [Line Items]
Total debt	$ 978							$ 0
Interest rate of debt instrument	2.50%	2.50%	2.50%	2.50%		2.50%	2.50%
Debt instrument, face amount | €		€ 800				€ 300	€ 500
0.75% senior unsecured notes due 2031 | Senior notes
Debt Instrument [Line Items]
Total debt	$ 2,127							$ 1,949
Interest rate of debt instrument	0.75%	0.75%	0.75%	0.75%				0.75%	0.75%	0.75%	0.75%
Debt instrument, face amount | €		€ 1,800							€ 1,800
0.65% senior unsecured notes due 2032 | Senior notes
Debt Instrument [Line Items]
Total debt	$ 514							$ 488
Interest rate of debt instrument	0.65%	0.65%	0.65%	0.65%				0.65%	0.65%	0.65%	0.65%
Debt instrument, face amount | ¥			¥ 53.2							¥ 53.2
1.35% senior unsecured notes due 2039 | Senior notes
Debt Instrument [Line Items]
Total debt	$ 1,511							$ 1,384
Interest rate of debt instrument	1.35%	1.35%	1.35%	1.35%				1.35%	1.35%	1.35%	1.35%
Debt instrument, face amount | €		€ 1,300							€ 1,300
3.25% senior unsecured notes due 2039 | Senior notes
Debt Instrument [Line Items]
Total debt	$ 889							$ 890
Interest rate of debt instrument	3.25%	3.25%	3.25%	3.25%				3.25%	3.25%	3.25%	3.25%
4.375% senior unsecured notes due 2045 | Senior notes
Debt Instrument [Line Items]
Total debt	$ 499							$ 499
Interest rate of debt instrument	4.375%	4.375%	4.375%	4.375%				4.375%	4.375%	4.375%	4.375%
1.8% senior unsecured notes due 2049 | Senior notes
Debt Instrument [Line Items]
Total debt	$ 907							$ 831
Interest rate of debt instrument	1.80%	1.80%	1.80%	1.80%				1.80%	1.80%	1.80%	1.80%
Debt instrument, face amount | €		€ 750							€ 750
3.4% senior unsecured notes due 2049 | Senior notes
Debt Instrument [Line Items]
Total debt	$ 889							$ 890
Interest rate of debt instrument	3.40%	3.40%	3.40%	3.40%				3.40%	3.40%	3.40%	3.40%
2.6% senior unsecured notes due 2050 | Senior notes
Debt Instrument [Line Items]
Total debt	$ 979							$ 0
Interest rate of debt instrument	2.60%	2.60%	2.60%	2.60%	2.60%
Debt instrument, face amount					$ 1,000
Other
Debt Instrument [Line Items]
Total debt	$ 31							$ 75