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Pension and Postretirement Benefit Plans (Narratives) (Details) (USD $)
In Millions, unless otherwise specified
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1 Months Ended |
3 Months Ended |
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Mar. 31, 2015
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Mar. 31, 2015
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Dec. 31, 2014
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Mar. 31, 2014
Insurer
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Mar. 31, 2011
LimitedPartner
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| Benefit Plan Information |
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| Estimated pension and postretirement employer contributions in current fiscal year |
$ 200 |
$ 200 |
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| Curtailment/Settlement gain |
17 |
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| 3M Japan company provided contribution match to their defined contribution plan |
6.12% |
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| Number of additional limited partners of WG Trading Company, in addition to 3M, who objected and appealed the court's order to the United States Court of Appeals for the Second Circuit |
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6 |
| Number of insurers 3M and certain benefit plans filed lawsuits on seeking insurance coverage for the WG Trading Company claim |
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5 |
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| Percentage of WG Trading Company holdings in relation to total fair value of the company's total plan assets, high end of range (as a percent) |
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0.50% |
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| Qualified and Non-qualified Pension Benefits |
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| Benefit Plan Information |
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| Company contributions year to date |
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90 |
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| Postretirement Benefits |
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| Benefit Plan Information |
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| Company contributions year to date |
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$ 1 |
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