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Equity - Accumulated Other Comprehensive Income/(Loss) (Net of Tax) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  | $ (2,459) |  |
Ending Balance |  | (2,312) | $ (2,459) |
Foreign Currency Translation Adjustments [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  | (1,878) | (1,139) | $ (2,592)
Other comprehensive income/(loss) before reclassifications |  | 84 | (739) | 1,075
Amounts reclassified to the statements of income |  |  |  | 378
Net other comprehensive loss before tax |  | 84 | (739) | 1,453
Net other comprehensive loss after tax |  | 84 | (739) | 1,453
Ending Balance |  | (1,794) | (1,878) | (1,139)
Available-for-sale Securities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  | 1 | (4) | (7)
Cumulative effect of new accounting standard (See Note 1) |  |  | 5 |
Other comprehensive income/(loss) before reclassifications |  | (1) | (1) | 64
Amounts reclassified to the statements of income |  |  | 1 | (66)
Net other comprehensive loss before tax |  | (1) |  | (2)
Corresponding income tax |  |  |  | 5
Net other comprehensive loss after tax |  | (1) |  | 3
Ending Balance |  |  | 1 | (4)
Derivative Financial Instruments [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  | (504) | (619) | (479)
Other comprehensive income/(loss) before reclassifications |  | 54 | 87 | (167)
Amounts reclassified to the statements of income |  | 30 | 28 | 27
Net other comprehensive loss before tax |  | 84 | 115 | (140)
Net other comprehensive loss after tax |  | 84 | 115 | (140)
Ending Balance |  | (420) | (504) | (619)
Benefit Plans [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  | (78) | (91) | (81)
Other comprehensive income/(loss) before reclassifications |  | (11) | 4 | (3)
Amounts reclassified to the statements of income |  | (10) | 13 | (5)
Net other comprehensive loss before tax |  | (21) | 17 | (8)
Corresponding income tax |  | 1 | (4) | (2)
Net other comprehensive loss after tax |  | (20) | 13 | (10)
Ending Balance |  | (98) | (78) | (91)
AOCI Attributable to Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  | (2,459) | (1,853) | (3,159)
Cumulative effect of new accounting standard (See Note 1) | [1] |  | 5 |
Other comprehensive income/(loss) before reclassifications |  | 126 | (649) | 969
Amounts reclassified to the statements of income |  | 20 | 42 | 334
Net other comprehensive loss before tax |  | 146 | (607) | 1,303
Corresponding income tax |  | 1 | (4) | 3
Net other comprehensive loss after tax |  | 147 | (611) | 1,306
Ending Balance |  | $ (2,312) | $ (2,459) | $ (1,853)
[1] | Following the adoption of ASU 2016-01, the Company recorded a $ 5 million opening balance reclassification from accumulated other comprehensive income to retained earnings.

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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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