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Activity in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Balance at beginning of period | $ (7,113) |
Translation adjustment (net of tax effect of $30 and $13) | (82) | $ (141)
Current period changes in fair value (net of tax effect of $0 and $0) | (4) | 2
Current period changes in fair value (net of tax effect of $39 and $83) | 114 | 217
Balance at end of period | (4,659) | (5,876)
Foreign currency translation gain (loss): |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Balance at beginning of period | (981) | (1,078)
Translation adjustment (net of tax effect of $30 and $13) | (82) | (141)
Balance at end of period | (1,063) | (1,219)
Aggregate adjustment for the period, tax | 30 | 13
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Balance at beginning of period | 6 | 4
Current period changes in fair value (net of tax effect of $0 and $0) | (1) | 2
Reclassification to earnings (net of tax effect of $0 and $0) | (3) | 0
Balance at end of period | 2 | 6
Current period changes in fair value, tax effect | 0 | 0
Reclassification to earnings, tax effect | 0 | 0
Unrealized gain (loss) on cash flow hedges, net of tax: |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Balance at beginning of period | (223) | 112
Current period changes in fair value (net of tax effect of $39 and $83) | 124 | 263
Reclassification to earnings (net of tax effect of $(3) and $(15)) | (10) | (46)
Balance at end of period | (109) | 329
Current period changes in fair value, tax effect | 39 | 83
Reclassification to earnings, tax effect | (3) | (15)
Accumulated Defined Benefit Plans Adjustment [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Balance at beginning of period | (5,915) | (5,035)
Balance at end of period | (3,489) | (4,992)
Reclassification to earnings, tax effect | (780) | 14
Income Tax Expense Benefit [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Reclassification to earnings, tax effect | 0 | 0
Income Tax Expense Benefit [Member] | Unrealized gain (loss) on cash flow hedges, net of tax: |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Reclassification to earnings, tax effect | (3) | (15)
Net Income [Member] [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Reclassification to earnings (net of tax effect of $0 and $0) | (3) | 0
Net Income [Member] [Member] | Unrealized gain (loss) on cash flow hedges, net of tax: |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Reclassification to earnings (net of tax effect of $(3) and $(15)) | $ (10) | $ (46)

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- Definition Accumulated Other Comprehensive Income (Loss) [Roll Forward] + 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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