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Financing arrangements (Debt Issuances) (Details) - USD ($)	Dec. 31, 2020	May 31, 2020	Feb. 29, 2020
Debt Instrument [Line Items]
Commercial paper, maximum borrowing capacity	$ 2,500,000,000
Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount of notes issued		$ 4,000,000,000.0	$ 5,000,000,000.0
Notes [Member] | 1.90% notes due 2025 (1.90% 2025 Notes) [Member]
Debt Instrument [Line Items]
Aggregate principal amount of notes issued			$ 500,000,000
Interest rate, stated percentage	1.90%		1.90%
Notes [Member] | 2.20% notes due 2027 (2.20% 2027 notes) [Member]
Debt Instrument [Line Items]
Aggregate principal amount of notes issued		$ 1,000,000,000.0	$ 750,000,000
Interest rate, stated percentage	2.20%	2.20%	2.20%
Notes [Member] | 2.45% notes due 2031 (2.45% 2031 Notes) [Member]
Debt Instrument [Line Items]
Aggregate principal amount of notes issued			$ 1,250,000,000
Interest rate, stated percentage	2.45%		2.45%
Notes [Member] | 3.15% notes due 2040 (3.15% 2040 Notes) [Member]
Debt Instrument [Line Items]
Aggregate principal amount of notes issued		$ 750,000,000	$ 1,250,000,000
Interest rate, stated percentage	3.15%	3.15%	3.15%
Notes [Member] | Three Point Three Seven Five Percent Notes Due 2050 [Member]
Debt Instrument [Line Items]
Aggregate principal amount of notes issued		$ 1,000,000,000.0	$ 1,250,000,000
Interest rate, stated percentage	3.375%	3.375%	3.375%
Notes [Member] | 2.30% notes due 2031 (2.30% 2031 Notes) [Member]
Debt Instrument [Line Items]
Aggregate principal amount of notes issued		$ 1,250,000,000
Interest rate, stated percentage	2.30%	2.30%

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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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=120391452&loc=d3e13212-122682

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