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Restructuring and other cost savings initiatives (Summary of Charges by Type) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Restructuring Cost and Reserve [Line Items] |  |
Separation Costs | $ 49 | $ 377
Asset Impairments/Disposals | (111) | 87
Accelerated Depreciation | 100 | 55
Other | 76 | 39
Total | 114 | 558
Cost of sales [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Separation Costs | 0 | 0
Asset Impairments/Disposals | 0 | 81
Accelerated Depreciation | 50 | 23
Other | 2 | 0
Total | 52 | 104
Research and development [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Separation Costs | 0 | 0
Asset Impairments/Disposals | 0 | 0
Accelerated Depreciation | 36 | 28
Other | 28 | 21
Total | 64 | 49
Selling, general and administrative [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Separation Costs | 0 | 0
Asset Impairments/Disposals | 0 | 0
Accelerated Depreciation | 14 | 4
Other | 42 | 5
Total | 56 | 9
Other operating income (expense) [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Separation Costs | 49 | 377
Asset Impairments/Disposals | (111) | 6
Accelerated Depreciation | 0 | 0
Other | 4 | 13
Total | $ (58) | $ 396

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