Financing (Components Of Debt) (Details) € in Millions, SFr in Millions, $ in Millions, ¥ in Billions	Apr. 02, 2021 USD ($)	Apr. 02, 2021 EUR (€)	Apr. 02, 2021 JPY (¥)	Apr. 02, 2021 CHF (SFr)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)	Dec. 31, 2020 JPY (¥)	Dec. 31, 2020 CHF (SFr)
Debt Instrument [Line Items]
Long-term debt	$ 20,277				$ 21,204
Less: currently payable	10				11
Long-term debt excluding currently payable	20,267				21,193
Other
Debt Instrument [Line Items]
Long-term debt	29				31
Commercial paper | Euro-denominated commercial paper
Debt Instrument [Line Items]
Long-term debt	588	€ 500			611	€ 500
Senior notes | 0.352% senior notes due 2021
Debt Instrument [Line Items]
Long-term debt	$ 0				$ 290
Interest rate of debt instrument	0.352%	0.352%	0.352%	0.352%	0.352%	0.352%	0.352%	0.352%
Aggregate principal amount | ¥			¥ 30.0				¥ 30.0
Senior notes | Floating rate senior notes due 2022
Debt Instrument [Line Items]
Long-term debt	$ 294				$ 305
Aggregate principal amount | €		€ 250				€ 250
Senior notes | 2.05% senior notes due 2022
Debt Instrument [Line Items]
Long-term debt	$ 698				$ 698
Interest rate of debt instrument	2.05%	2.05%	2.05%	2.05%	2.05%	2.05%	2.05%	2.05%
Senior notes | 1.7% senior notes due 2024
Debt Instrument [Line Items]
Long-term debt	$ 1,054				$ 1,096
Interest rate of debt instrument	1.70%	1.70%	1.70%	1.70%	1.70%	1.70%	1.70%	1.70%
Aggregate principal amount | €		€ 900				€ 900
Senior notes | 2.2% senior notes due 2024
Debt Instrument [Line Items]
Long-term debt	$ 697				$ 697
Interest rate of debt instrument	2.20%	2.20%	2.20%	2.20%	2.20%	2.20%	2.20%	2.20%
Senior notes | 2.5% senior notes due 2025
Debt Instrument [Line Items]
Long-term debt	$ 938				$ 975
Interest rate of debt instrument	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Aggregate principal amount | €		€ 800				€ 800
Senior notes | 3.35% senior notes due 2025
Debt Instrument [Line Items]
Long-term debt	$ 498				$ 498
Interest rate of debt instrument	3.35%	3.35%	3.35%	3.35%	3.35%	3.35%	3.35%	3.35%
Senior notes | 0.2% senior notes due 2026
Debt Instrument [Line Items]
Long-term debt	$ 1,462				$ 1,520
Interest rate of debt instrument	0.20%	0.20%	0.20%	0.20%	0.20%	0.20%	0.20%	0.20%
Aggregate principal amount | €		€ 1,300				€ 1,300
Senior notes | 2.1% senior notes due 2026
Debt Instrument [Line Items]
Long-term debt	$ 937				$ 975
Interest rate of debt instrument	2.10%	2.10%	2.10%	2.10%	2.10%	2.10%	2.10%	2.10%
Aggregate principal amount | €		€ 800				€ 800
Senior notes | 0.3% senior notes due 2027
Debt Instrument [Line Items]
Long-term debt	$ 278				$ 297
Interest rate of debt instrument	0.30%	0.30%	0.30%	0.30%	0.30%	0.30%	0.30%	0.30%
Aggregate principal amount | ¥			¥ 30.8				¥ 30.8
Senior notes | 1.2% senior notes due 2027
Debt Instrument [Line Items]
Long-term debt	$ 702				$ 729
Interest rate of debt instrument	1.20%	1.20%	1.20%	1.20%	1.20%	1.20%	1.20%	1.20%
Aggregate principal amount | €		€ 600				€ 600
Senior notes | 0.45% senior notes due 2028
Debt Instrument [Line Items]
Long-term debt	$ 1,460				$ 1,518
Interest rate of debt instrument	0.45%	0.45%	0.45%	0.45%	0.45%	0.45%	0.45%	0.45%
Aggregate principal amount | €		€ 1,300				€ 1,300
Senior notes | 2.6% senior notes due 2029
Debt Instrument [Line Items]
Long-term debt	$ 795				$ 795
Interest rate of debt instrument	2.60%	2.60%	2.60%	2.60%	2.60%	2.60%	2.60%	2.60%
Senior notes | 2.5% senior notes due 2030
Debt Instrument [Line Items]
Long-term debt	$ 941				$ 978
Interest rate of debt instrument	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Aggregate principal amount | €		€ 800				€ 800
Senior notes | 0.75% senior notes due 2031
Debt Instrument [Line Items]
Long-term debt	$ 2,046				$ 2,127
Interest rate of debt instrument	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%
Aggregate principal amount | €		€ 1,800				€ 1,800
Senior notes | 0.65% senior notes due 2032
Debt Instrument [Line Items]
Long-term debt	$ 479				$ 514
Interest rate of debt instrument	0.65%	0.65%	0.65%	0.65%	0.65%	0.65%	0.65%	0.65%
Aggregate principal amount | ¥			¥ 53.2				¥ 53.2
Senior notes | 1.35% senior notes due 2039
Debt Instrument [Line Items]
Long-term debt	$ 1,453				$ 1,511
Interest rate of debt instrument	1.35%	1.35%	1.35%	1.35%	1.35%	1.35%	1.35%	1.35%
Aggregate principal amount | €		€ 1,300				€ 1,300
Senior notes | 3.25% senior notes due 2039
Debt Instrument [Line Items]
Long-term debt	$ 889				$ 889
Interest rate of debt instrument	3.25%	3.25%	3.25%	3.25%	3.25%	3.25%	3.25%	3.25%
Senior notes | 4.375% senior notes due 2045
Debt Instrument [Line Items]
Long-term debt	$ 499				$ 499
Interest rate of debt instrument	4.375%	4.375%	4.375%	4.375%	4.375%	4.375%	4.375%	4.375%
Senior notes | 1.8% senior notes due 2049
Debt Instrument [Line Items]
Long-term debt	$ 872				$ 907
Interest rate of debt instrument	1.80%	1.80%	1.80%	1.80%	1.80%	1.80%	1.80%	1.80%
Aggregate principal amount | €		€ 750				€ 750
Senior notes | 3.4% senior notes due 2049
Debt Instrument [Line Items]
Long-term debt	$ 889				$ 889
Interest rate of debt instrument	3.40%	3.40%	3.40%	3.40%	3.40%	3.40%	3.40%	3.40%
Senior notes | 2.6% Senior Unsecured Notes Due 2050
Debt Instrument [Line Items]
Long-term debt	$ 979				$ 979
Interest rate of debt instrument	2.60%	2.60%	2.60%	2.60%	2.60%	2.60%	2.60%	2.60%
Convertible debt | Zero-coupon LYONs due 2021
Debt Instrument [Line Items]
Long-term debt	$ 0				$ 24
Interest rate of debt instrument	0.00%	0.00%	0.00%	0.00%
Bonds | 0.5% senior bonds due 2023
Debt Instrument [Line Items]
Long-term debt	$ 574				$ 611
Interest rate of debt instrument	0.50%	0.50%	0.50%	0.50%	0.50%	0.50%	0.50%	0.50%
Aggregate principal amount | SFr				SFr 540				SFr 540
Bonds | 1.125% senior bonds due 2028
Debt Instrument [Line Items]
Long-term debt	$ 226				$ 241
Interest rate of debt instrument	1.125%	1.125%	1.125%	1.125%	1.125%	1.125%	1.125%	1.125%
Aggregate principal amount | SFr				SFr 210				SFr 210