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Significant Accounting Policies (Details)
In Millions, except Per Share data, unless otherwise specified
|
3 Months Ended |
12 Months Ended |
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|
Mar. 31, 2015
USD ($)
|
Mar. 31, 2014
USD ($)
|
Dec. 31, 2014
|
Mar. 31, 2015
VEF
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| Foreign Currency Translation |
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|
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| Threshold percentage used to determine if economic environment is highly inflationary |
100.00% |
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| Number of years used to determine if economic environment is highly inflationary |
3 years |
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| Operating income of Venezuelan subsidiary as percent of consolidated amount high end of range |
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|
1.00% |
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| Cumulative inflation rate of Venezuela in November 2009 and since, low end of range |
100.00% |
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|
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| Maximum balance of company's net monetary assets in Venezuelan bolivars |
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|
|
100 |
| Maximum balance of intercompany receivables due to 3M Company from its Venezuelan subsidiary |
20 |
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| Exchange rate established by Venezuelan government from bolivars to dollars - CENCOEX |
6 |
|
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| Exchange rate established by Venezuelan government from bolivars to dollars - SICAD |
12 |
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| Exchange rate established by Venezuelan government from bolivars to dollars - SIMADI |
190 |
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| Earnings per share |
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|
|
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| Options outstanding not included in computation of diluted earnings per share (in shares) |
3.5 |
2.3 |
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| Numerator: |
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|
|
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| Net income attributable to 3M |
$ 1,199 |
$ 1,207 |
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| Denominator: |
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| Denominator for weighted average 3M common shares outstanding - basic (in shares) |
636.2 |
661.5 |
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| Dilution associated with the Company's stock-based compensation plans (in shares) |
13.0 |
13.0 |
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| Denominator for weighted average 3M common shares outstanding - diluted (in shares) |
649.2 |
674.5 |
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| Earnings per share attributable to 3M common shareholders - basic (in dollars per share) |
$ 1.88 |
$ 1.83 |
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| Earnings per share attributable to 3M common shareholders - diluted (in dollars per share) |
$ 1.85 |
$ 1.79 |
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