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Financing arrangements (Debt Repayments) (Details) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 EUR (€)
Debt Instrument [Line Items]
Repayments of debt	$ 6,450	$ 4,514		$ 1,121
Make-whole payments recognized in interest expense	1,262	1,289		1,392
Notes [Member]
Debt Instrument [Line Items]
Repayments of debt	6,500	4,500		1,100
Make-whole payments recognized in interest expense	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% euro-denominated notes due 2019 (2.125% 2019 euro Notes) [Member]
Debt Instrument [Line Items]
Repayments of debt		$ 864	€ 675
Interest rate, stated percentage		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] | 6.15% notes due 2018 (6.15% 2018 Notes) [Member]
Debt Instrument [Line Items]
Repayments of debt				$ 500
Interest rate, stated percentage				6.15%	6.15%
Notes [Member] | 4.375% euro-denominated notes due 2018 (4.375% 2018 euro Notes) [Member]
Debt Instrument [Line Items]
Repayments of debt				$ 621	€ 550
Interest rate, stated percentage				4.375%	4.375%
Notes [Member] | 4.50% notes due 2020 (4.50% 2020 Notes) [Member]
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) [Member]
Debt Instrument [Line Items]
Repayments of debt	$ 750
Interest rate, stated percentage	2.125%
Notes [Member] | 2.20% notes due 2020 (2.20% 2020 Notes) [Member]
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) [Member]
Debt Instrument [Line Items]
Repayments of debt	$ 900
Interest rate, stated percentage	3.45%
Notes [Member] | 4.10% notes due 2021 (4.10% 2021 Notes) [Member]
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) [Member]
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) [Member]
Debt Instrument [Line Items]
Repayments of debt	$ 1,750
Interest rate, stated percentage	3.875%
Notes [Member] | Floating Rate Notes Due 2020 [Member]
Debt Instrument [Line Items]
Repayments of debt	$ 300

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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