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Activity in Accumulated Other Comprehensive Income (Loss) (Phantoms) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Balance at beginning of period |  |  | $ (4,994) |  |
Change in foreign currency translation adjustment, net of tax | $ (33) | $ (78) | 20 | $ (84) |
Balance at end of period | (4,815) | (5,346) | (4,815) | (5,346) |
Foreign currency translation gain (loss): |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Balance at beginning of period | (1,073) | (983) | (1,126) | (930) |
Change in foreign currency translation adjustment, net of tax | (33) | (78) | 20 | (84) |
Balance at end of period | (1,106) | (1,061) | (1,106) | (1,061) |
Aggregate adjustment for the period, tax | (7) | 34 | 2 | 25 |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Balance at beginning of period | 2 | (5) | (2) | (2) |
Balance at end of period | 7 | (5) | 7 | (5) |
Current period changes in fair value, tax effect | 3 | 0 | 3 | (1) |
Reclassification to earnings, tax effect | 0 | 0 | 0 | 1 |
Unrealized gain (loss) on cash flow hedges, net of tax: |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Balance at beginning of period | 116 | (511) | 40 | (366) |
Reclassification to retained earnings pursuant to the early adoption of ASU 2018-02 |  |  |  |  | $ (79)
Balance at end of period | 104 | (179) | 104 | (179) |
Current period changes in fair value, tax effect | 5 | 100 | 33 | 67 |
Reclassification to earnings, tax effect | (9) | 6 | (13) | 18 |
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Balance at beginning of period | (3,863) | (4,139) | (3,906) | (3,569) |
Balance at end of period | (3,820) | (4,101) | (3,820) | (4,101) |
Reclassification to earnings, tax effect | $ 14 | $ 12 | $ 27 | $ 24 |

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