Financing arrangements (Principal Amounts and Carrying Value of Long-term Borrowings) (Details) $ in Millions	Sep. 30, 2022 USD ($)	Sep. 30, 2022 CHF (SFr)	Sep. 30, 2022 EUR (€)	Sep. 30, 2022 GBP (£)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Unamortized bond discounts, premiums and issuance costs, net	$ (1,252)					$ (1,213)
Fair value adjustments	(450)					284
Other	13					15
Total carrying value of debt	38,704					33,309
Less current portion	(1,543)					(87)
Total long-term debt	37,161					33,222
4.20% 2052 Notes [Member]
Debt Instrument [Line Items]
Face amount					$ 1,000
Notes
Debt Instrument [Line Items]
Face amount	$ 3,000				$ 4,000
Notes | 0.41% CHF700 million bonds due 2023 (0.41% 2023 Swiss franc Bonds)
Debt Instrument [Line Items]
Interest rate, stated percentage	0.41%	0.41%	0.41%	0.41%
Long-term debt, gross	$ 709					767
Face amount | SFr		SFr 700,000,000
Notes | 2.25% notes due 2023 (2.25% 2023 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	2.25%	2.25%	2.25%	2.25%
Long-term debt, gross	$ 750					750
Notes | 3.625% notes due 2024 (3.625% 2024 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	3.625%	3.625%	3.625%	3.625%
Long-term debt, gross	$ 1,400					1,400
Notes | 1.90% notes due 2025 (1.90% 2025 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	1.90%	1.90%	1.90%	1.90%
Long-term debt, gross	$ 500					500
Notes | 3.125% notes due 2025 (3.125% 2025 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	3.125%	3.125%	3.125%	3.125%
Long-term debt, gross	$ 1,000					1,000
Notes | 2.00% €750 million notes due 2026 (2.00% 2026 euro Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	2.00%	2.00%	2.00%	2.00%
Long-term debt, gross	$ 735					853
Face amount | €			€ 750,000,000
Notes | 2.60% notes due 2026 (2.60% 2026 notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	2.60%	2.60%	2.60%	2.60%
Long-term debt, gross	$ 1,250					1,250
Notes | 5.50% £475 million notes due 2026 (5.50% 2026 pound sterling Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	5.50%	5.50%	5.50%	5.50%
Long-term debt, gross	$ 531					643
Face amount | £				£ 475,000,000
Notes | 2.20% notes due 2027 (2.20% 2027 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	2.20%	2.20%	2.20%	2.20%
Long-term debt, gross	$ 1,724					1,750
Notes | 3.20% notes due 2027 (3.20% 2027 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	3.20%	3.20%	3.20%	3.20%
Long-term debt, gross	$ 1,000					1,000
Notes | 1.65% notes due 2028 (1.65% 2028 Notes) [Member}
Debt Instrument [Line Items]
Interest rate, stated percentage	1.65%	1.65%	1.65%	1.65%
Long-term debt, gross	$ 1,234					1,250
Notes | 3.00% 2029 Notes [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	3.00%	3.00%	3.00%	3.00%	3.00%
Long-term debt, gross	$ 750					0
Face amount					$ 750
Notes | 4.05% 2029 Notes [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	4.05%	4.05%	4.05%	4.05%
Long-term debt, gross	$ 1,250					0
Face amount	$ 1,250
Notes | 4.00% £700 million notes due 2029 (4.00% 2029 pound sterling Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	4.00%	4.00%	4.00%	4.00%
Long-term debt, gross	$ 782					947
Face amount | £				£ 700,000,000
Notes | 2.45% notes due 2030 (2.45% 2030 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	2.45%	2.45%	2.45%	2.45%
Long-term debt, gross	$ 1,250					1,250
Notes | 2.30% notes due 2031 (2.30% 2031 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	2.30%	2.30%	2.30%	2.30%
Long-term debt, gross	$ 1,250					1,250
Notes | 2.00% notes due 2032 (2.00% 2032 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	2.00%	2.00%	2.00%	2.00%
Long-term debt, gross	$ 1,051					1,250
Notes | 3.35% 2032 Notes [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	3.35%	3.35%	3.35%	3.35%	3.35%
Long-term debt, gross	$ 1,000					0
Face amount					$ 1,000
Notes | 4.20% 2033 Notes [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	4.20%	4.20%	4.20%	4.20%
Long-term debt, gross	$ 750					0
Face amount	$ 750
Notes | 6.375% notes due 2037 (6.375% 2037 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	6.375%	6.375%	6.375%	6.375%
Long-term debt, gross	$ 478					478
Notes | 6.90% notes due 2038 (6.90% 2038 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	6.90%	6.90%	6.90%	6.90%
Long-term debt, gross	$ 254					254
Notes | 6.40% notes due 2039 (6.40% 2039 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	6.40%	6.40%	6.40%	6.40%
Long-term debt, gross	$ 333					333
Notes | 3.15% notes due 2040 (3.15% 2040 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	3.15%	3.15%	3.15%	3.15%
Long-term debt, gross	$ 2,000					2,000
Notes | 5.75% notes due 2040 (5.75% 2040 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	5.75%	5.75%	5.75%	5.75%
Long-term debt, gross	$ 373					373
Notes | 2.80% notes due 2041 (2.80% 2041 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	2.80%	2.80%	2.80%	2.80%
Long-term debt, gross	$ 1,110					1,150
Notes | 4.95% notes due 2041 (4.95% 2041 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	4.95%	4.95%	4.95%	4.95%
Long-term debt, gross	$ 600					600
Notes | 5.15% notes due 2041 (5.15% 2041 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	5.15%	5.15%	5.15%	5.15%
Long-term debt, gross	$ 729					729
Notes | 5.65% notes due 2042 (5.65% 2042 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	5.65%	5.65%	5.65%	5.65%
Long-term debt, gross	$ 415					415
Notes | 5.375% notes due 2043 (5.375% 2043 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	5.375%	5.375%	5.375%	5.375%
Long-term debt, gross	$ 185					185
Notes | 4.40% notes due 2045 (4.40% 2045 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	4.40%	4.40%	4.40%	4.40%
Long-term debt, gross	$ 2,250					2,250
Notes | 4.563% notes due 2048 (4.563% 2048 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	4.563%	4.563%	4.563%	4.563%
Long-term debt, gross	$ 1,415					1,415
Notes | 3.375% notes due 2050 (3.375% 2050 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	3.375%	3.375%	3.375%	3.375%
Long-term debt, gross	$ 2,250					2,250
Notes | 4.663% notes due 2051 (4.663% 2051 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	4.663%	4.663%	4.663%	4.663%
Long-term debt, gross	$ 3,541					3,541
Notes | 3.00% notes due 2052 (3.00% 2052 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	3.00%	3.00%	3.00%	3.00%
Long-term debt, gross	$ 1,254					1,350
Notes | 4.20% 2052 Notes [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	4.20%	4.20%	4.20%	4.20%	4.20%
Long-term debt, gross	$ 1,000					0
Notes | 4.875% 2053 Notes [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	4.875%	4.875%	4.875%	4.875%
Long-term debt, gross	$ 1,000					0
Face amount	$ 1,000
Notes | Two Point Seven Seven Percent Notes Due Two Zero Five Three
Debt Instrument [Line Items]
Interest rate, stated percentage	2.77%	2.77%	2.77%	2.77%
Long-term debt, gross	$ 940					940
Notes | 4.40% 2062 Notes [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	4.40%	4.40%	4.40%	4.40%	4.40%
Long-term debt, gross	$ 1,250					0
Face amount					$ 1,250
Notes | Other notes due 2097 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 100					$ 100