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SUMMARY OF ACCOUNTING POLICIES - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Hedge margin liabilities |  |  |  |  | $ 17 |  |  |  |  | $ 17 |  |
Investments and Restricted Cash | $ 170 |  |  |  | 483 |  |  |  | $ 170 | 483 |  |
Allowance for doubtful account | 94 |  |  |  | 104 |  |  |  | 94 | 104 |  |
Provision for doubtful accounts expense |  |  |  |  |  |  |  |  | 118 | 133 | $ 116 |
Inventories | 421 |  |  |  | 404 |  |  |  | 421 | 404 |  |
Capitalized interest |  |  |  |  |  |  |  |  | 97 | 49 | 14 |
Net currency transaction gains and (losses), pre-tax |  |  |  |  |  |  |  |  | (19) | 3 | 5 |
Income tax benefit |  |  |  |  |  |  |  |  | (1,228) | (2,232) | (1,699) |
Decrease in other financing activities |  |  |  |  |  |  |  |  | 5,692 | (3,287) | 3,140 |
Increase in operating activities |  |  |  |  |  |  |  |  | 12,711 | 1,479 | 6,473 |
Operating lease, future minimal payments | 2,967 |  |  |  |  |  |  |  | 2,967 |  |  |
Revenues | (19,848) | $ (17,444) | $ (17,456) | $ (17,113) | (18,975) | $ (16,173) | $ (15,927) | $ (15,510) | (71,861) | (66,585) | (61,610) |
Costs and Expenses |  |  |  |  |  |  |  |  | 64,837 | 59,056 | 53,922 |
Retained earnings | 8,006 |  |  |  | 5,852 |  |  |  | 8,006 | 5,852 |  |
Decrease to AOCI | 4,994 |  |  |  | 4,867 |  |  |  | 4,994 | 4,867 | $ 4,483 |
Licenses |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived intangible assets | 5 |  |  |  |  |  |  |  | 5 |  |  |
Trade Names |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived intangible assets | 200 |  |  |  |  |  |  |  | $ 200 |  |  |
Change in Assumptions for Pension Plans |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial gains or losses in excess of market-related value of plan assets or the plans' projected benefit obligations |  |  |  |  |  |  |  |  | 10.00% |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Employee share-based awards, Vesting Period |  |  |  |  |  |  |  |  | 3 years |  |  |
Minimum | Other Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, estimated useful lives range, Minimum |  |  |  |  |  |  |  |  | 2 years |  |  |
Minimum | Capitalized software |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, estimated useful lives range, Minimum |  |  |  |  |  |  |  |  | 7 years |  |  |
Minimum | Vehicles |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives range Minimum |  |  |  |  |  |  |  |  | 6 years |  |  |
Minimum | Aircraft |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives range Minimum |  |  |  |  |  |  |  |  | 12 years |  |  |
Minimum | Buildings |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives range Minimum |  |  |  |  |  |  |  |  | 20 years |  |  |
Minimum | Plant Equipment |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives range Minimum |  |  |  |  |  |  |  |  | 3 years |  |  |
Minimum | Technology equipment |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives range Minimum |  |  |  |  |  |  |  |  | 3 years |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Employee share-based awards, Vesting Period |  |  |  |  |  |  |  |  | 5 years |  |  |
Maximum | Other Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, estimated useful lives range, Minimum |  |  |  |  |  |  |  |  | 22 years |  |  |
Maximum | Vehicles |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives range Minimum |  |  |  |  |  |  |  |  | 15 years |  |  |
Maximum | Aircraft |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives range Minimum |  |  |  |  |  |  |  |  | 30 years |  |  |
Maximum | Buildings |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives range Minimum |  |  |  |  |  |  |  |  | 40 years |  |  |
Maximum | Plant Equipment |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives range Minimum |  |  |  |  |  |  |  |  | 20 years |  |  |
Maximum | Technology equipment |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives range Minimum |  |  |  |  |  |  |  |  | 5 years |  |  |
Self-insurance requirements [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investments and Restricted Cash | 142 |  |  |  | 449 |  |  |  | $ 142 | 449 |  |
cash held in escrow [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restricted Cash and Cash Equivalents, Noncurrent | $ 9 |  |  |  | $ 15 |  |  |  | 9 | 15 |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefit |  |  |  |  |  |  |  |  | 38 | 71 |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Costs and Expenses |  |  |  |  |  |  |  |  | $ 709 | $ 0 |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  | $ 735
Decrease to AOCI |  |  |  |  |  |  |  |  |  |  |  | $ 735

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