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SHAREOWNERS' EQUITY - Activity in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Balance at beginning of year | $ (5,997) | $ (4,994) |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | 97 | 48 | $ (149)
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax | 2 | 6 | 0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | (335) | 72 | 485
Balance at end of period | (7,113) | (5,997) | (4,994)
Foreign currency translation gain (loss) |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Balance at beginning of year | (1,078) | (1,126) | (930)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | 97 | 48 | (149)
Balance at end of period | (981) | (1,078) | (1,126)
Aggregate adjustment for the period, tax effect | (36) | 10 | 37
Foreign currency translation gain (loss) | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect | 0 | 0 | (47)
Unrealized gain (loss) on marketable securities, net of tax |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Balance at beginning of year | 4 | (2) | (2)
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax | 6 | 11 | (3)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | (4) | (5) | 3
Balance at end of period | 6 | 4 | (2)
Current period changes in fair value, tax effect | 1 | 4 | (1)
Reclassification to earnings, tax effect | (1) | (1) | 1
Unrealized gain (loss) on cash flow hedges, net of tax |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Balance at beginning of year | 112 | 40 | (366)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | (192) | 195 | 429
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | (143) | (123) | 56
Balance at end of period | (223) | 112 | 40
Current period changes in fair value, tax effect | (61) | 61 | 135
Reclassification to earnings, tax effect | (45) | (39) | 18
Unrealized gain (loss) on cash flow hedges, net of tax | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect | 0 | 0 | (79)
Unrecognized pension and postretirement benefit costs, net of tax |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Balance at beginning of year | (5,035) | (3,906) | (3,569)
Net actuarial gain (loss) and prior service cost resulting from remeasurements of plan assets and liabilities (net of tax effect of $(1,885), $(979)and $(355)) | (5,984) | (3,117) | (1,117)
Reclassification to earnings (net of tax effect of $1,607, $626 and $439) | 5,104 | 1,988 | 1,389
Balance at end of period | (5,915) | (5,035) | (3,906)
Net actuarial gain (loss) and prior service cost resulting from remeasurements of plan assets and liabilities, tax effect | (1,885) | (979) | (355)
Reclassification to earnings, tax effect | 1,607 | 626 | 439
Unrecognized pension and postretirement benefit costs, net of tax | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect | $ 0 | $ 0 | $ (609)

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- Definition Accumulated Other Comprehensive Income (Loss) [Roll Forward] + References No definition available. + Details
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- Definition The tax effect on elements that Includes the accumulated change in the value of either the projected benefit obligation or the plans assets resulting from experience different from that assumed or from a change in an actuarial assumption, after tax. Also includes the cost or benefit resulting from a plan amendment that occurred during the period, after tax. These amounts have not been recognized in net periodic benefit cost pursuant to SFAS 87 and 106. + References No definition available. + Details
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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: 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=121641772&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: 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=121641772&loc=SL7669686-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 7: 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=121641772&loc=d3e681-108580 + Details
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- Definition Amount after 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 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 + Details
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- Definition Amount of tax expense (benefit), after 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32262-110900 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e640-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30755-110894 Reference 4: 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=121641772&loc=SL7669646-108580 + Details
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- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities. + References Reference 1: 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=121641772&loc=d3e689-108580 Reference 2: 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=121641772&loc=d3e637-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 Reference 4: 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=121641772&loc=SL34724391-108580 + Details
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