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Restructuring and other cost savings initiatives (Summary of Expenses and Payments) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring liabilities as of beginning of period | $ 20 | $ 118 | $ 244 | $ 0
Expense | 79 | 19 | 132 | 385
Payments | (31) | (117) | (258) | (141)
Restructuring liabilities as of end of period | 68 | 20 | 118 | 244
Separation costs [Member] |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring liabilities as of beginning of period | 11 | 95 | 221 | 0
Expense | 72 | 6 | 52 | 353
Payments | (20) | (90) | (178) | (132)
Restructuring liabilities as of end of period | 63 | 11 | 95 | 221
Other [Member] |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring liabilities as of beginning of period | 9 | 23 | 23 | 0
Expense | 7 | 13 | 80 | 32
Payments | (11) | (27) | (80) | (9)
Restructuring liabilities as of end of period | $ 5 | $ 9 | $ 23 | $ 23

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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