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Financing arrangements (Debt Issuances) (Details)	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 EUR (€)	Dec. 31, 2018 CHF (SFr)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Short-term loan					$ 605,000,000
Commercial paper, maximum borrowing capacity		$ 2,500,000,000
Commercial paper issued	$ 12,300,000,000
Commercial paper repaid	12,300,000,000
Commercial paper, maximum outstanding	1,500,000,000.0
0.41% 2023 Swiss franc Bonds [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		0.41%	0.41%	0.41%
Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount of notes issued	$ 4,500,000,000				$ 6,700,000,000
Notes [Member] | 1.90% notes due 2019 (1.90% 2019 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	1.90%	1.90%	1.90%	1.90%
Notes [Member] | 2.20% notes due 2020 (2.20% 2020 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	2.20%	2.20%	2.20%	2.20%
Notes [Member] | 2.65% notes due 2022 (2.65% 2022 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	2.65%	2.65%	2.65%	2.65%
Notes [Member] | 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%
Notes [Member] | 1.85% notes due 2021 (1.85% 2021 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		1.85%	1.85%	1.85%	1.85%
Notes [Member] | 1.25% notes due 2022 (1.25% 2022 euro Notes) [Member]
Debt Instrument [Line Items]
Aggregate principal amount of notes issued | €			€ 1,250,000,000
Interest rate, stated percentage		1.25%	1.25%	1.25%	1.25%
Notes [Member] | 0.41% 2023 Swiss franc Bonds [Member]
Debt Instrument [Line Items]
Aggregate principal amount of notes issued | SFr				SFr 700,000,000
Interest rate, stated percentage		0.41%	0.41%	0.41%	0.41%
Notes [Member] | 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%
Notes [Member] | 2.00% 2026 euro Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount of notes issued | €			€ 750,000,000
Interest rate, stated percentage		2.00%	2.00%	2.00%	2.00%
Notes [Member] | 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%
Notes [Member] | 4.40% notes due 2045 (4.40% 2045 Notes) [Member]
Debt Instrument [Line Items]
Aggregate principal amount of notes issued					$ 1,000,000,000
Interest rate, stated percentage		4.40%	4.40%	4.40%	4.40%
Debt instrument, unamortized premium					$ 79,000,000

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