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Activity in Accumulated Other Comprehensive Income (Loss) (Phantoms) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Balance at beginning of period |  |  | $ (4,867) |  |  |
Change in foreign currency translation adjustment, net of tax | $ (78) | $ 24 | (84) | $ 54 |  |
Balance at end of period | (5,346) | (4,202) | (5,346) | (4,202) |  |
Foreign currency translation gain (loss): |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Balance at beginning of period |  |  | (930) | (1,016) |  |
Change in foreign currency translation adjustment, net of tax |  |  | (84) | 54 |  |
Reclassification to retained earnings pursuant to the early adoption of ASU 2018-02 |  |  |  |  | $ (47) | $ 0
Balance at end of period | (1,061) | (962) | (1,061) | (962) |  |
Aggregate adjustment for the period, tax |  |  | 25 | (93) |  |
Unrealized gain (loss) on marketable securities, net of tax: |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Balance at beginning of period |  |  | (2) | (1) |  |
Balance at end of period | (5) | 0 | (5) | 0 |  |
Current period changes in fair value, tax effect |  |  | (1) | 0 |  |
Reclassification to earnings, tax effect |  |  | 1 | 0 |  |
Unrealized gain (loss) on cash flow hedges, net of tax: |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Balance at beginning of period |  |  | (366) | (45) |  |
Reclassification to retained earnings pursuant to the early adoption of ASU 2018-02 |  |  |  |  | (79) | 0
Balance at end of period | (179) | (237) | (179) | (237) |  |
Current period changes in fair value, tax effect |  |  | 67 | (109) |  |
Reclassification to earnings, tax effect |  |  | 18 | (7) |  |
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Balance at beginning of period |  |  | (3,569) | (3,421) |  |
Reclassification to retained earnings pursuant to the early adoption of ASU 2018-02 |  |  |  |  | $ (609) | $ 0
Balance at end of period | $ (4,101) | $ (3,003) | (4,101) | (3,003) |  |
Reclassification to earnings, tax effect |  |  | 24 | 37 |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Adjustment for Settlement or Curtailment Gain (Loss), Tax |  |  | $ 0 | $ 214 |  |

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