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SHAREOWNERS' EQUITY - Additional Information (Detail) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) Vote Classes_of_Common_Stock $ / shares shares | Jun. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) shares | Sep. 30, 2021 USD ($) Vote Classes_of_Common_Stock $ / shares shares | Sep. 30, 2020 USD ($) shares | Aug. 31, 2021 USD ($) | May 31, 2016 USD ($)
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Classes of Common Stock, Number | Classes_of_Common_Stock | 2 |  |  | 2 |  |  |
Preferred stock, shares authorized | shares | 200,000,000 |  |  | 200,000,000 |  |  |
Preferred stock, par value | $ / shares | $ 0.01 |  |  | $ 0.01 |  |  |
Preferred stock, issued | shares | 0 |  |  | 0 |  |  |
Purchases of common stock |  |  |  | $ 500 | $ 224 |  |
Change in non-controlling minority interest | $ (1) |  | $ 1 | $ 4 | $ (2) |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Plan Amendments, Reclassification Adjustment from AOCI, before Tax |  | $ 66 |  |  |  |  |
May 2016 Share Repurchase Program |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Common stock authorized for purchase, amount |  |  |  |  |  |  | $ 8,000
Common stock purchases | shares | 0 |  | 0 | 0 | 2,100,000 |  |
Total of Class A and Class B common stock, repurchased, value |  |  |  |  | $ 217 |  |
Purchases of common stock |  |  |  |  | 224 |  |
August 2021 Share Repurchase Program |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Common stock authorized for purchase, amount |  |  |  |  |  | $ 5,000 |
Common stock purchases | shares | 2,600,000 |  |  | 2,600,000 |  |  |
Total of Class A and Class B common stock, repurchased, value | $ 500 |  |  | $ 500 |  |  |
Share repurchase authorization available | $ 4,500 |  |  | $ 4,500 |  |  |
Class A common stock |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Votes per common share | Vote | 10 |  |  | 10 |  |  |
Common stock, par value | $ / shares | $ 0.01 |  |  | $ 0.01 |  |  |
Common stock, shares authorized | shares | 4,600,000,000 |  |  | 4,600,000,000 |  |  |
Class B common stock |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Votes per common share | Vote | 1 |  |  | 1 |  |  |
Common stock, par value | $ / shares | $ 0.01 |  |  | $ 0.01 |  |  |
Common stock, shares authorized | shares | 5,600,000,000 |  |  | 5,600,000,000 |  |  |
Net income |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
TotalOtherComprehensiveIncomeReclassification, Net of Tax | $ (15) |  | $ (15) | $ 2,452 | (2) |  |
Unrealized gain (loss) on cash flow hedges, net of tax: |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax | (5) |  | (8) | (9) | (39) |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | 14 |  | 27 | 27 | 125 |  |
Unrealized gain (loss) on cash flow hedges, net of tax: | Income tax expense |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax | (5) |  | (8) | (9) | (39) |  |
Unrealized gain (loss) on cash flow hedges, net of tax: | Net income |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | 14 |  | 27 | 27 | 125 |  |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Reclassification to earnings (net of tax effect of $_ and $12) | (29) |  | (43) | (2,421) | 130 |  |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Income tax expense |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax | 9 |  | 13 | (763) | 40 |  |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Net income |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Reclassification to earnings (net of tax effect of $_ and $12) | (29) |  | (43) | 2,421 | (130) |  |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Investment income and other |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | (38) |  | (56) | (109) | (170) |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax |  |  |  | 3,290 | 0 |  |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Other expenses |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | 0 |  | 0 | 69 | 0 |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Plan Amendments, Reclassification Adjustment from AOCI, before Tax | 0 |  | 0 | (66) | 0 |  |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Reclassification to earnings, tax effect | 0 |  | 0 | 0 | (1) |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | 0 |  | 1 | 4 | 3 |  |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Income tax expense |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Reclassification to earnings, tax effect | 0 |  | 0 | 0 | (1) |  |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Net income |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | 0 |  | 1 | 4 | 3 |  |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Investment income and other |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | 0 |  | 1 | 4 | 4 |  |
Foreign Exchange Contracts | Interest expense |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive income | 0 |  | 0 | 0 | 0 |  |
Foreign Exchange Contracts | Investment income and other |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive income | 0 |  | 0 | 0 | 0 |  |
Foreign Exchange Contracts | Revenue |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive income | 22 |  | 38 | 44 | 173 |  |
Foreign Exchange Contracts | Unrealized gain (loss) on cash flow hedges, net of tax: | Revenue |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive income | 22 |  | 38 | 44 | 173 |  |
Interest Contracts | Interest expense |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive income | (3) |  | (3) | (8) | (9) |  |
Interest Contracts | Investment income and other |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive income | 0 |  | 0 | 0 | 0 |  |
Interest Contracts | Revenue |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive income | 0 |  | 0 | 0 | 0 |  |
Interest Contracts | Unrealized gain (loss) on cash flow hedges, net of tax: | Interest expense |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive income | $ (3) |  | $ (3) | $ (8) | $ (9) |  |

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