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Restructuring - Charges and Spending Relating to Restructuring Activities by Program (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve, beginning balance | $ 541 | $ 645 |
Expenses | 927 | 1,069 | $ 1,110
(Payments) receipts, net | (722) | (760) |
Non-cash activity | 1 | (413) |
Restructuring reserve, ending balance | 747 | 541 | 645
Separation Costs |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve, beginning balance | 395 | 592 |
Expenses | 552 | 216 | 208
(Payments) receipts, net | (328) | (413) |
Non-cash activity | 0 | 0 |
Restructuring reserve, ending balance | 619 | 395 | 592
Accelerated Depreciation |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve, beginning balance | 0 | 0 |
Expenses | 60 | 227 | 174
(Payments) receipts, net | 0 | 0 |
Non-cash activity | (60) | (227) |
Restructuring reserve, ending balance | 0 | 0 | 0
Other |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve, beginning balance | 146 | 53 |
Expenses | 315 | 626 | 728
(Payments) receipts, net | (394) | (347) |
Non-cash activity | 61 | (186) |
Restructuring reserve, ending balance | $ 128 | $ 146 | $ 53

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- Definition Noncash activity affecting the restructuring reserve, including accelerated depreciation. + References No definition available. + Details
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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with 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 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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- Definition Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost. + References Reference 1: 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 2: 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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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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