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Restructuring and Other Charges - Activity and Reserve Balances for Restructuring Charges (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | $ 25 | $ 58 | $ 58
Cash payments | (17) |  | (49)
Restructuring charges | 11 |  | 124
Other | 48 |  | (108)
Restructuring reserve ending balance | 67 |  | 25
Restructuring and other charges | (12) | (7) |
Layoff costs |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | 10 | 56 | 56
Cash payments | (14) |  | (47)
Restructuring charges | 11 |  | 111
Other | 57 |  | (110)
Restructuring reserve ending balance | 64 |  | 10
Other exit costs |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring reserve beginning balance | 15 | 2 | 2
Cash payments | (3) |  | (2)
Restructuring charges | 0 |  | 13
Other | (9) |  | 2
Restructuring reserve ending balance | 3 |  | 15
Restructuring and other charges |  | $ 4 |
Elimination Of Life Insurance Benefits |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring and other charges | 58 |  |
Pension Settlement Cost |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring and other charges | (2) |  |
Other Exit Costs, Reclassification Of Lease Exit Costs |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring and other charges | $ 9 |  |
Employee Severance Cost, Reclassification Of Pension Costs |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Other |  |  | 119
Employee Severance Costs, Credit In Post-Retirement Costs |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring and other charges |  |  | 28
Employee Severance, Reversal Of Prior Restructuring |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring and other charges |  |  | $ 19

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- Definition Restructuring reserve period expenses. + 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/disclosureRef -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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3367-108585 + 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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=115931487&loc=d3e140904-122747 + Details
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- Definition Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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