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Activity in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  |  | $ (4,994) |  |  |
Translation adjustment (net of tax effect of $41 and $1) | $ (48) | $ (28) | (28) | $ (112) |  |
Current period changes in fair value (net of tax effect of $1 and $(1)) | (3) | (1) | 6 | (4) |  |
Current period changes in fair value (net of tax effect of $79 and $14) | 206 | 49 | 270 | 315 |  |
Balance at end of period | (4,617) | (5,288) | (4,617) | (5,288) |  |
Foreign currency translation gain (loss): |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | (1,106) | (1,061) | (1,126) | (930) |  |
Translation adjustment (net of tax effect of $41 and $1) | (48) | (28) | (28) | (112) |  |
Balance at end of period | (1,154) | (1,089) | (1,154) | (1,089) |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax |  |  | 0 | (47) |  |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | 7 | (5) | (2) | (2) |  |
Current period changes in fair value (net of tax effect of $1 and $(1)) | 2 | (2) | 11 | (6) |  |
Balance at end of period | 4 | (6) | 4 | (6) |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | 1 | 0 | 1 | 1 |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | 5 | (1) | (5) | 2 |  |
Unrealized gain (loss) on cash flow hedges, net of tax: |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | 104 | (179) | 40 | (366) |  |
Current period changes in fair value (net of tax effect of $79 and $14) | 251 | 44 | 355 | 254 |  |
Reclassification from AOCI pursuant to the early adoption of ASU 2018-02 |  |  |  |  | $ 0 | $ (79)
Reclassification to earnings (net of tax effect of $(14) and $1) | 45 | (5) | (85) | 61 |  |
Balance at end of period | 310 | (130) | 310 | (130) |  |
Reclassification to earnings, tax effect | (14) | 1 | 27 | 19 |  |
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | (3,820) | (4,101) | (3,906) | (3,569) |  |
Remeasurement of plan assets and liabilities (net of tax effect of $0 and $214) (1) | 43 | 38 | 129 | 115 |  |
Balance at end of period | (3,777) | (4,063) | (3,777) | (4,063) |  |
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax |  |  | 0 | (609) |  |
Income Tax Expense Benefit [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | (1) | 0 | (1) | 1 |  |
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 | (14) | 1 | (27) | 19 |  |
Income Tax Expense Benefit [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax | 14 | 12 | 41 | 36 |  |
Net Income [Member] [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |
TotalOtherComprehensiveIncomeReclassification, Net of Tax | 7 | (44) | (39) | (178) |  |
Net Income [Member] [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | (5) | 1 | (5) | 2 |  |
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 $(14) and $1) | (45) | 5 | (85) | 61 |  |
Net Income [Member] [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax | (43) | (38) | (129) | (115) |  |
Labor and Related Expense [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | (57) | (50) | (170) | (151) |  |
Foreign exchange contracts | Interest Expense | Unrealized gain (loss) on cash flow hedges, net of tax: |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax | 62 | 0 | 124 | (62) |  |
Interest rate contracts | Interest Expense | Unrealized gain (loss) on cash flow hedges, net of tax: |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax | $ (3) | $ (6) | $ (12) | $ (18) |  |

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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=114867106&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=114867106&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=114867106&loc=d3e681-108580 + Details
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