Financing arrangements (Interest Rate and Cross-currency Swaps) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2021 EUR (€)	Dec. 31, 2021 CHF (SFr)	Dec. 31, 2021 GBP (£)
Debt Instrument [Line Items]
Net Cash Provided by (Used in) Operating Activities	$ 9,261	$ 10,497	$ 9,150
Repayments of debt	4,150	6,450	4,514
Interest rate swap contracts [Member] | Designated as Hedging Instrument [Member]
Debt Instrument [Line Items]
Notional amount	6,700	5,900
Derivative, Notional Amount, Amount Terminated	$ 750	3,650
Net Cash Provided by (Used in) Operating Activities		576
Interest Rate Swap, One [Member] | Interest rate swap contracts [Member] | Designated as Hedging Instrument [Member]
Debt Instrument [Line Items]
Derivative, Notional Amount, Amount Terminated		5,200
Interest Rate Swap, Two [Member] | Interest rate swap contracts [Member] | Designated as Hedging Instrument [Member]
Debt Instrument [Line Items]
Notional amount		5,200
0.41% Swiss Franc 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%
0.41% Swiss Franc Bonds Due 2023 (0.41% 2023 Swiss franc Bonds) | Cross-currency swap contract [Member] | Cash flow hedge [Member]
Debt Instrument [Line Items]
Notional amount	$ 704				SFr 700,000,000
2.00% €750 million notes due 2026 (2.00% 2026 euro Notes) | Cross-currency swap contract [Member] | Cash flow hedge [Member]
Debt Instrument [Line Items]
Notional amount	833			€ 750,000,000
5.50% 2026 pound sterling Notes [Member] | Cross-currency swap contract [Member] | Cash flow hedge [Member]
Debt Instrument [Line Items]
Notional amount	747					£ 475,000,000
4.00% 2029 pound sterling Notes [Member] | Cross-currency swap contract [Member] | Cash flow hedge [Member]
Debt Instrument [Line Items]
Notional amount	$ 1,111					£ 700,000,000
1.25% 2022 euro Notes [Member] | Cross-currency swap contract [Member] | Cash flow hedge [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	1.25%			1.25%	1.25%	1.25%
Notional amount | €				€ 1,250,000,000
Notes payable [Member]
Debt Instrument [Line Items]
Notional amount	$ 6,650	5,900
Notes payable [Member] | 3.625% notes due 2022 (3.625% 2022 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	3.625%			3.625%	3.625%	3.625%
Notional amount	$ 0	$ 750
Notes payable [Member] | 3.625% notes due 2022 (3.625% 2022 Notes) | LIBOR [Member]
Debt Instrument [Line Items]
Derivative, effective interest rate		2.70%
Notes payable [Member] | 0.41% Swiss Franc 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%
Notes payable [Member] | 3.625% notes due 2024 (3.625% 2024 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	3.625%			3.625%	3.625%	3.625%
Notional amount	$ 1,400	$ 1,400
Notes payable [Member] | 3.625% notes due 2024 (3.625% 2024 Notes) | LIBOR [Member]
Debt Instrument [Line Items]
Derivative, effective interest rate	3.20%	3.20%		3.20%	3.20%	3.20%
Notes payable [Member] | 3.125% notes due 2025 (3.125% 2025 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	3.125%			3.125%	3.125%	3.125%
Notional amount	$ 1,000	$ 1,000
Notes payable [Member] | 3.125% notes due 2025 (3.125% 2025 Notes) | LIBOR [Member]
Debt Instrument [Line Items]
Derivative, effective interest rate	1.80%	1.80%		1.80%	1.80%	1.80%
Notes payable [Member] | 2.600% notes due 2026 (2.60% 2026 notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	2.60%			2.60%	2.60%	2.60%
Notional amount	$ 1,250	$ 1,250
Notes payable [Member] | 2.600% notes due 2026 (2.60% 2026 notes) [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Derivative, effective interest rate	1.80%	1.80%		1.80%	1.80%	1.80%
Notes payable [Member] | 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%
Notes payable [Member] | 2.45% notes due 2030 (2.45% 2030 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	2.45%			2.45%	2.45%	2.45%
Notional amount	$ 1,000	$ 0
Notes payable [Member] | 2.45% notes due 2030 (2.45% 2030 Notes) | LIBOR [Member]
Debt Instrument [Line Items]
Derivative, effective interest rate	1.00%			1.00%	1.00%	1.00%
Notes payable [Member] | 2.30% notes due 2031 (2.30% 2031 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	2.30%			2.30%	2.30%	2.30%
Notional amount	$ 500	0
Notes payable [Member] | 2.30% notes due 2031 (2.30% 2031 Notes) | LIBOR [Member]
Debt Instrument [Line Items]
Derivative, effective interest rate	0.80%			0.80%	0.80%	0.80%
Notes payable [Member] | 4.663% notes due 2051 (4.663% 2051 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	4.663%			4.663%	4.663%	4.663%
Notional amount	$ 1,500	1,500
Notes payable [Member] | 4.663% notes due 2051 (4.663% 2051 Notes) | LIBOR [Member]
Debt Instrument [Line Items]
Derivative, effective interest rate	4.10%			4.10%	4.10%	4.10%
Notes [Member]
Debt Instrument [Line Items]
Face amount	$ 5,000	9,000
Repayments of debt	$ 4,200	$ 6,500	$ 4,500
Notes [Member] | 2.20% notes due 2019 (2.20% 2019 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage			2.20%
Repayments of debt			$ 1,400
Notes [Member] | 3.45% notes due 2020 (3.45% 2020 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage		3.45%
Repayments of debt		$ 900
Notes [Member] | 4.10% notes due 2021 (4.10% 2021 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage		4.10%
Repayments of debt		$ 1,000
Notes [Member] | 3.875% notes due 2021 (3.875% 2021 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage		3.875%
Repayments of debt		$ 1,750
Notes [Member] | 3.625% notes due 2022 (3.625% 2022 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	3.625%	3.625%		3.625%	3.625%	3.625%
Repayments of debt	$ 750
Notes [Member] | 0.41% Swiss Franc 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%
Face amount | SFr					SFr 700,000,000
Notes [Member] | 3.625% notes due 2024 (3.625% 2024 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	3.625%	3.625%		3.625%	3.625%	3.625%
Notes [Member] | 3.125% notes due 2025 (3.125% 2025 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	3.125%	3.125%		3.125%	3.125%	3.125%
Notes [Member] | 2.600% notes due 2026 (2.60% 2026 notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	2.60%	2.60%		2.60%	2.60%	2.60%
Notes [Member] | 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%
Face amount | €				€ 750,000,000
Notes [Member] | 5.50% 2026 pound sterling Notes [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	5.50%			5.50%	5.50%	5.50%
Face amount | £						£ 475,000,000
Notes [Member] | 6.375% notes due 2037 (6.375% 2037 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	6.375%	6.375%		6.375%	6.375%	6.375%
Debt Conversion, Converted Instrument, Amount		$ 74
Notes [Member] | 4.00% 2029 pound sterling Notes [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	4.00%			4.00%	4.00%	4.00%
Face amount | £						£ 700,000,000
Notes [Member] | 2.45% notes due 2030 (2.45% 2030 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	2.45%	2.45%		2.45%	2.45%	2.45%
Notional amount	$ 1,000
Face amount		$ 1,250
Notes [Member] | 2.30% notes due 2031 (2.30% 2031 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	2.30%	2.30%		2.30%	2.30%	2.30%
Notional amount	$ 500
Face amount		$ 1,250
Notes [Member] | 6.90% notes due 2038 (6.90% 2038 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	6.90%	6.90%		6.90%	6.90%	6.90%
Debt Conversion, Converted Instrument, Amount		$ 37
Notes [Member] | 6.40% notes due 2039 (6.40% 2039 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	6.40%	6.40%		6.40%	6.40%	6.40%
Debt Conversion, Converted Instrument, Amount		$ 133
Notes [Member] | 5.75% notes due 2040 (5.75% 2040 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	5.75%	5.75%		5.75%	5.75%	5.75%
Debt Conversion, Converted Instrument, Amount		$ 39
Notes [Member] | 5.15% notes due 2041 (5.15% 2041 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	5.15%	5.15%		5.15%	5.15%	5.15%
Debt Conversion, Converted Instrument, Amount		$ 245
Notes [Member] | 5.65% notes due 2042 (5.65% 2042 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	5.65%	5.65%		5.65%	5.65%	5.65%
Debt Conversion, Converted Instrument, Amount		$ 72
Notes [Member] | 5.375% notes due 2043 (5.375% 2043 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	5.375%	5.375%		5.375%	5.375%	5.375%
Debt Conversion, Converted Instrument, Amount		$ 76
Notes [Member] | 4.663% notes due 2051 (4.663% 2051 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	4.663%	4.663%		4.663%	4.663%	4.663%
Notes [Member] | 2.77% notes due 2053 (2.77% 2053 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	2.77%	2.77%		2.77%	2.77%	2.77%
Face amount		$ 940
Debt exchange additional cash consideration		85
Debt Instrument, Unamortized Discount		$ 264
Notes [Member] | 1.25% 2022 euro Notes [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	1.25%	1.25%		1.25%	1.25%	1.25%
Repayments of debt			1,400
Notes [Member] | 2.125% notes due 2020 (2.125% 2020 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage		2.125%
Repayments of debt		$ 750	$ 864