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Restructuring - Charges and Spending Relating to Restructuring Activities by Program (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring reserve, beginning balance |  |  | $ 541 |
Expense | $ 180 | $ 212 | 605 | $ 759
(Payments) receipts, net |  |  | (563) |
Non-cash activity |  |  | 13 |
Restructuring reserve, ending balance | 596 |  | 596 |
Separation Costs |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring reserve, beginning balance |  |  | 395 |
Expense | 100 | 61 | 302 | 172
(Payments) receipts, net |  |  | (224) |
Non-cash activity |  |  | 0 |
Restructuring reserve, ending balance | 473 |  | 473 |
Accelerated Depreciation |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring reserve, beginning balance |  |  | 0 |
Expense | 6 | 33 | 61 | 210
(Payments) receipts, net |  |  | 0 |
Non-cash activity |  |  | (61) |
Restructuring reserve, ending balance | 0 |  | 0 |
Other |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring reserve, beginning balance |  |  | 146 |
Expense | 74 | $ 118 | 242 | $ 377
(Payments) receipts, net |  |  | (339) |
Non-cash activity |  |  | 74 |
Restructuring reserve, ending balance | $ 123 |  | $ 123 |

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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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