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Financing arrangements (Debt Repayments) (Details) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2021 EUR (€)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)
Debt Instrument [Line Items]
Repayments of debt	$ 4,150		$ 6,450	$ 4,514
Make-whole payments recognized in interest expense	1,197		1,262	1,289
Notes [Member]
Debt Instrument [Line Items]
Repayments of debt	4,200		6,500	4,500
Make-whole payments recognized in interest expense	$ 24		$ 96
Notes [Member] | 2.20% notes due 2019 (2.20% 2019 Notes) [Member]
Debt Instrument [Line Items]
Repayments of debt				$ 1,400
Interest rate, stated percentage				2.20%	2.20%
Notes [Member] | 5.70% notes due 2019 (5.70% 2019 Notes) [Member]
Debt Instrument [Line Items]
Repayments of debt				$ 1,000
Interest rate, stated percentage				5.70%	5.70%
Notes [Member] | 2.125% 2019 Euro Notes
Debt Instrument [Line Items]
Repayments of debt | €					€ 675
Interest rate, stated percentage			2.125%	2.125%	2.125%
Notes [Member] | 1.90% notes due 2019 (1.90% 2019 Notes) [Member]
Debt Instrument [Line Items]
Repayments of debt				$ 700
Interest rate, stated percentage				1.90%	1.90%
Notes [Member] | Floating Rate Notes Due 2019 [Member]
Debt Instrument [Line Items]
Repayments of debt				$ 550
Notes [Member] | 4.50% notes due 2020 (4.50% 2020 Notes)
Debt Instrument [Line Items]
Repayments of debt			$ 300
Interest rate, stated percentage			4.50%
Notes [Member] | 2.125% notes due 2020 (2.125% 2020 Notes)
Debt Instrument [Line Items]
Repayments of debt			$ 750	$ 864
Interest rate, stated percentage			2.125%
Notes [Member] | 2.20% notes due 2020 (2.20% 2020 Notes)
Debt Instrument [Line Items]
Repayments of debt			$ 700
Interest rate, stated percentage			2.20%
Notes [Member] | 3.45% notes due 2020 (3.45% 2020 Notes)
Debt Instrument [Line Items]
Repayments of debt			$ 900
Interest rate, stated percentage			3.45%
Notes [Member] | Floating Rate Notes Due 2020
Debt Instrument [Line Items]
Repayments of debt			$ 300
Notes [Member] | 4.10% notes due 2021 (4.10% 2021 Notes)
Debt Instrument [Line Items]
Repayments of debt			$ 1,000
Interest rate, stated percentage			4.10%
Notes [Member] | 1.85% notes due 2021 (1.85% 2021 Notes)
Debt Instrument [Line Items]
Repayments of debt			$ 750
Interest rate, stated percentage			1.85%
Notes [Member] | 3.875% notes due 2021 (3.875% 2021 Notes)
Debt Instrument [Line Items]
Repayments of debt			$ 1,750
Interest rate, stated percentage			3.875%
Notes [Member] | 1.25% notes due 2022 (1.25% 2022 Notes)
Debt Instrument [Line Items]
Repayments of debt | €		€ 1,250
Interest rate, stated percentage	1.25%	1.25%
Notes [Member] | 2.70% notes due 2022 (2.70% 2022 Notes)
Debt Instrument [Line Items]
Repayments of debt	$ 500
Interest rate, stated percentage	2.70%	2.70%
Notes [Member] | 2.65% notes due 2022 (2.65% 2022 Notes)
Debt Instrument [Line Items]
Repayments of debt			$ 1,500
Interest rate, stated percentage	2.65%	2.65%
Notes [Member] | 3.625% notes due 2022 (3.625% 2022 Notes)
Debt Instrument [Line Items]
Repayments of debt	$ 750
Interest rate, stated percentage	3.625%	3.625%	3.625%
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%
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%

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