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Special Charges - Components of Special Charges (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Other Income and Expenses [Abstract] |  |
Impairment of assets | $ 50 | $ 8
Severance and benefit costs | 0 | 6
(Gains) losses on sale of assets and other special charges | 13 | 4
Total operating special charges | 63 | 18
Nonoperating credit loss on BRW Term Loan and related guarantee | 697 | 0
Nonoperating unrealized (gains) losses on investments | 319 | (17)
Total special charges, credit losses and unrealized (gains) losses on investments, net | 1,079 | 1
Income tax benefit, net of valuation allowance | (14) | 0
Total special charges, credit losses and unrealized (gains) losses on investments, net of income taxes | $ 1,065 | $ 1

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- Definition Amount of gain (loss) on sale of other assets and other miscellaneous charges. + References No definition available. + Details
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- Definition Amount of credit loss expense (reversal of expense) for financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(11)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 + Details
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