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Financing arrangements (Interest Rate and Cross-currency Swaps) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
0.41% 2023 Swiss franc Bonds [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	0.41%
5.50% 2026 pound sterling Notes [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	5.50%
Notes payable [Member]
Debt Instrument [Line Items]
Notional amount	$ 10,950	$ 9,450
Notes payable [Member] | 2.20% notes due 2019 (2.20% 2019 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	2.20%
Notional amount	$ 1,400	1,400
Notes payable [Member] | 2.20% notes due 2019 (2.20% 2019 Notes) [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Derivative, effective interest rate	0.60%
Notes payable [Member] | 3.45% notes due 2020 (3.45% 2020 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	3.45%
Notional amount	$ 900	900
Notes payable [Member] | 3.45% notes due 2020 (3.45% 2020 Notes) [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Derivative, effective interest rate	1.10%
Notes payable [Member] | 4.10% notes due 2021 (4.10% 2021 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	4.10%
Notional amount	$ 1,000	1,000
Notes payable [Member] | 4.10% notes due 2021 (4.10% 2021 Notes) [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Derivative, effective interest rate	1.70%
Notes payable [Member] | 3.875% notes due 2021 (3.875% 2021 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	3.875%
Notional amount	$ 1,750	1,750
Notes payable [Member] | 3.875% notes due 2021 (3.875% 2021 Notes) [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Derivative, effective interest rate	2.00%
Notes payable [Member] | 3.625% notes due 2022 (3.625% 2022 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	3.625%
Notional amount	$ 750	750
Notes payable [Member] | 3.625% notes due 2022 (3.625% 2022 Notes) [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Derivative, effective interest rate	1.60%
Notes payable [Member] | 3.625% notes due 2024 (3.625% 2024 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	3.625%
Notional amount	$ 1,400	1,400
Notes payable [Member] | 3.625% notes due 2024 (3.625% 2024 Notes) [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Derivative, effective interest rate	1.40%
Notes payable [Member] | 3.125% notes due 2025 (3.125% 2025 Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	3.125%
Notional amount	$ 1,000	1,000
Notes payable [Member] | 3.125% notes due 2025 (3.125% 2025 Notes) [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Derivative, effective interest rate	0.90%
Notes payable [Member] | 2.600% notes due 2026 (2.60% 2026 notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	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	0.30%
Notes payable [Member] | 2.125% 2019 euro Notes [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	2.125%
Notes payable [Member] | 1.25% notes due 2022 (1.25% 2022 euro Notes) [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	1.25%
Notes payable [Member] | 0.41% 2023 Swiss franc Bonds [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	0.41%
Notes payable [Member] | 2.00% 2026 euro Notes [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	2.00%
Notes payable [Member] | 4.00% 2029 pound sterling Notes [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	4.00%
Notes payable [Member] | 4.663% 2051 Notes [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	4.663%
Notional amount	$ 1,500	$ 0
Notes payable [Member] | 4.663% 2051 Notes [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Derivative, effective interest rate	0.00%

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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