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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Beginning balance | $ (375) |
Foreign currency translation adjustment | (78) | $ 29
Ending balance | (461) |
Foreign Currency Translation |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Beginning balance | (103) | (121)
Foreign currency translation adjustment | (77) | 29
Tax on foreign currency translation adjustment | (13) | (4)
Ending balance | (193) | (96)
Postretirement Benefit Plans |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Beginning balance | (269) | (214)
Income tax impact on amortization of postretirement benefit plan items | (1) | (1)
Ending balance | (266) | (213)
Derivative Instruments |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Beginning balance | (3) | (1)
Unrealized loss on derivative hedge agreements | (2) | (9)
Income tax benefit on unrealized loss on derivative hedge agreements |  | 1
Ending balance | (2) | (7)
Total |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Beginning balance | (375) | (336)
Foreign currency translation adjustment | (77) | 29
Tax on foreign currency translation adjustment | (13) | (4)
Income tax impact on amortization of postretirement benefit plan items | (1) | (1)
Unrealized loss on derivative hedge agreements | (2) | (9)
Income tax benefit on unrealized loss on derivative hedge agreements |  | 1
Ending balance | (461) | (316)
Other non-operating income | Postretirement Benefit Plans |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Amortization of prior service cost and net actuarial loss on postretirement benefit plans into other non-operating income (expense), net | 4 | 2
Other non-operating income | Total |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Amortization of prior service cost and net actuarial loss on postretirement benefit plans into other non-operating income (expense), net | 4 | 2
Revenue | Derivative Instruments |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Reclassification of unrealized gain (loss) on foreign exchange agreements | 2 | 1
Revenue | Total |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Reclassification of unrealized gain (loss) on foreign exchange agreements | 2 | 1
Cost of Revenue | Derivative Instruments |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Reclassification of unrealized gain (loss) on foreign exchange agreements | 1 | 1
Cost of Revenue | Total |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Reclassification of unrealized gain (loss) on foreign exchange agreements | $ 1 | $ 1

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580 + Details
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- Definition Amount before tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 35 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118948100&loc=d3e30304-110892 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32022-110900 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 + Details
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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive income for translation gain (loss) realized upon the sale or liquidation of an investment in a foreign entity and foreign currency hedges that are designated and qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL34724391-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e709-108580 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e689-108580 + Details
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