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Financing arrangements (Debt Repayments) (Details) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2018 EUR (€)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Repayments of debt	$ 1,121		$ 4,405	$ 3,725
Repayments of short-term debt			605
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] | 2.125% notes due 2017 (2.125% 2017 Notes) [Member]
Debt Instrument [Line Items]
Repayments of debt			$ 1,250
Interest rate, stated percentage			2.125%
Notes [Member] | Floating rate notes due 2017 [Member]
Debt Instrument [Line Items]
Repayments of debt			$ 600
Notes [Member] | 1.25% notes due 2017 (1.25% 2017 Notes) [Member]
Debt Instrument [Line Items]
Repayments of debt			$ 850
Interest rate, stated percentage			1.25%
Notes [Member] | 5.85% notes due 2017 (5.85% 2017 Notes) [Member]
Debt Instrument [Line Items]
Repayments of debt			$ 1,100
Interest rate, stated percentage			5.85%
Notes [Member] | 2.30% notes due 2016 (2.30% 2016 Notes) [Member]
Debt Instrument [Line Items]
Repayments of debt				$ 750
Interest rate, stated percentage				2.30%
Notes [Member] | 2.50% notes due 2016 (2.50% 2016 Notes) [Member]
Debt Instrument [Line Items]
Repayments of debt				$ 1,000
Interest rate, stated percentage				2.50%
Term loan due 2018 [Member]
Debt Instrument [Line Items]
Repayments of debt				$ 1,975

X

- Definition

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

+ References

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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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

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+ References

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-Topic 230
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