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Postretirement benefit plans - Plan assets by level three heirarchy (Details) (USD $)
In Millions, unless otherwise specified
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| U.S. defined benefit plan |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Fair value of plan assets |
$ 1,082us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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$ 941us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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$ 1,071us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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| U.S. defined benefit plan | Level 1 |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Fair value of plan assets |
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| U.S. defined benefit plan | Level 2 |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Fair value of plan assets |
1,082us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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| U.S. defined benefit plan | Level 3 |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Fair value of plan assets |
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| U.S. defined benefit plan | Fixed income securities and cash equivalents |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Fair value of plan assets |
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| U.S. defined benefit plan | Fixed income securities and cash equivalents | Level 1 |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Fair value of plan assets |
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| U.S. defined benefit plan | Fixed income securities and cash equivalents | Level 2 |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Fair value of plan assets |
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| U.S. defined benefit plan | Fixed income securities and cash equivalents | Level 3 |
|
|
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| Defined Benefit Plan Disclosure [Line Items] |
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| Fair value of plan assets |
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| U.S. defined benefit plan | Equity securities |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Fair value of plan assets |
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| U.S. defined benefit plan | Equity securities | Level 1 |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Fair value of plan assets |
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| U.S. defined benefit plan | Equity securities | Level 2 |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Fair value of plan assets |
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| U.S. defined benefit plan | Equity securities | Level 3 |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Fair value of plan assets |
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| U.S. defined benefit plan | Other |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Fair value of plan assets |
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| U.S. defined benefit plan | Other | Level 1 |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Fair value of plan assets |
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| U.S. defined benefit plan | Other | Level 2 |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Fair value of plan assets |
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|
| U.S. defined benefit plan | Other | Level 3 |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Fair value of plan assets |
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|
| U.S. retiree health care plan |
|
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| Defined Benefit Plan Disclosure [Line Items] |
|
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| Fair value of plan assets |
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| U.S. retiree health care plan | Level 1 |
|
|
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| Defined Benefit Plan Disclosure [Line Items] |
|
|
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| Fair value of plan assets |
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|
| U.S. retiree health care plan | Level 2 |
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| Defined Benefit Plan Disclosure [Line Items] |
|
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| Fair value of plan assets |
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|
| U.S. retiree health care plan | Level 3 |
|
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| Defined Benefit Plan Disclosure [Line Items] |
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| Fair value of plan assets |
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|
| U.S. retiree health care plan | Fixed income securities and cash equivalents |
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
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|
| Fair value of plan assets |
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|
| U.S. retiree health care plan | Fixed income securities and cash equivalents | Level 1 |
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
|
| Fair value of plan assets |
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| U.S. retiree health care plan | Fixed income securities and cash equivalents | Level 2 |
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
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| Fair value of plan assets |
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| U.S. retiree health care plan | Fixed income securities and cash equivalents | Level 3 |
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
|
| Fair value of plan assets |
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| U.S. retiree health care plan | Equity securities |
|
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|
| Defined Benefit Plan Disclosure [Line Items] |
|
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| Fair value of plan assets |
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|
| U.S. retiree health care plan | Equity securities | Level 1 |
|
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|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
|
| Fair value of plan assets |
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| U.S. retiree health care plan | Equity securities | Level 2 |
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|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
|
| Fair value of plan assets |
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| U.S. retiree health care plan | Equity securities | Level 3 |
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| Defined Benefit Plan Disclosure [Line Items] |
|
|
|
| Fair value of plan assets |
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| Non-U.S. defined benefit plan |
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| Defined Benefit Plan Disclosure [Line Items] |
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|
| Fair value of plan assets |
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| Non-U.S. defined benefit plan | Level 1 |
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| Defined Benefit Plan Disclosure [Line Items] |
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|
| Fair value of plan assets |
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| Non-U.S. defined benefit plan | Level 2 |
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
|
| Fair value of plan assets |
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| Non-U.S. defined benefit plan | Level 3 |
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
|
| Fair value of plan assets |
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| Non-U.S. defined benefit plan | Fixed income securities and cash equivalents |
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
|
| Fair value of plan assets |
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| Non-U.S. defined benefit plan | Fixed income securities and cash equivalents | Level 1 |
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
|
| Fair value of plan assets |
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|
| Non-U.S. defined benefit plan | Fixed income securities and cash equivalents | Level 2 |
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
|
| Fair value of plan assets |
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| Non-U.S. defined benefit plan | Fixed income securities and cash equivalents | Level 3 |
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|
| Defined Benefit Plan Disclosure [Line Items] |
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|
| Fair value of plan assets |
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| Non-U.S. defined benefit plan | Equity securities |
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
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|
| Fair value of plan assets |
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| Non-U.S. defined benefit plan | Equity securities | Level 1 |
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| Defined Benefit Plan Disclosure [Line Items] |
|
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| Fair value of plan assets |
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| Non-U.S. defined benefit plan | Equity securities | Level 2 |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Fair value of plan assets |
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| Non-U.S. defined benefit plan | Equity securities | Level 3 |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Fair value of plan assets |
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| Non-U.S. defined benefit plan | Other |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Fair value of plan assets |
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| Non-U.S. defined benefit plan | Other | Level 1 |
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| Defined Benefit Plan Disclosure [Line Items] |
|
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|
| Fair value of plan assets |
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| Non-U.S. defined benefit plan | Other | Level 2 |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Fair value of plan assets |
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| Non-U.S. defined benefit plan | Other | Level 3 |
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|
| Defined Benefit Plan Disclosure [Line Items] |
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|
| Fair value of plan assets |
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