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DEBT AND FINANCING ARRANGEMENTS - Additional Information (Detail) £ in Millions, $ in Millions |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 15, 2020 USD ($) | Apr. 01, 2020 USD ($) | Nov. 08, 2017 | May 18, 2017 | Dec. 31, 2020 USD ($) Tranches Credit_Agreements | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 EUR (€) Credit_Agreements | Dec. 31, 2020 GBP (£) Credit_Agreements | Dec. 31, 2020 CAD ($) Credit_Agreements
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt and Lease Obligation |  |  |  |  | $ 24,654,000,000 | $ 25,238,000,000 |  |  |  |
Number of tranches in debt instrument | Tranches |  |  |  |  | 2 |  |  |  |  |
Rent expense related to operating leases |  |  |  |  |  |  | $ 959,000,000 |  |  |
Outstanding letters of credit |  |  |  |  | $ 1,400,000,000 |  |  |  |  |
Surety bonds written |  |  |  |  | $ 1,300,000,000 |  |  |  |  |
Number of credit agreements | Credit_Agreements |  |  |  |  | 2 |  |  | 2 | 2 | 2
Covenants limit the amount of secured indebtedness that we may incur, and limit the amount of attributable debt in sale-leaseback transactions, to percentage of net tangible assets |  |  |  |  | 10.00% |  |  | 10.00% | 10.00% | 10.00%
Covenants limit the amount of secured indebtedness that we may incur, and limit the amount of attributable debt in sale-leaseback transactions, net tangible assets amount |  |  |  |  | $ 4,000,000,000.0 |  |  |  |  |
Long-term debt fair value |  |  |  |  | 28,300,000,000 | 26,900,000,000 |  |  |  |
Long-term Debt |  |  |  |  | 24,472,000,000 |  |  |  |  |
Debt instrument, face amount |  |  |  |  | 24,814,000,000 |  |  |  |  |
Commercial paper |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt and Lease Obligation |  |  |  |  | 15,000,000 | $ 3,234,000,000 |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 15,000,000 |  |  |  |  |
Euro Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  | 100.00% |  |  |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  |  | 1.29% | 2.82% |  | 1.29% | 1.29% | 1.29%
Senior notes | Maximum [Member] | LIBOR |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Applicable margin rates |  |  |  |  | 0.45% |  |  |  |  |
Senior notes | Minimum [Member] | LIBOR |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Applicable margin rates |  |  |  |  | 0.15% |  |  |  |  |
Revolving credit facility expiring in 2018 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Revolving credit facilities |  |  |  |  | $ 2,500,000,000 |  |  |  |  |
Line of Credit Facility, Fair Value of Amount Outstanding |  |  |  |  | $ 0 |  |  |  |  |
Revolving credit facility expiring in 2018 | Federal funds effective rate |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Applicable margin rates |  |  |  |  | 0.50% |  |  |  |  |
Revolving credit facility expiring in 2018 | LIBOR |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Applicable margin rates |  |  |  |  | 1.00% |  |  |  |  |
Revolving credit facility expiring in 2018 | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Applicable margin for base rate below LIBOR |  |  |  |  | 1.00% |  |  |  |  |
Revolving credit facility expiring in 2018 | Maximum [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Applicable margin rates |  |  |  |  | 0.75% |  |  |  |  |
Revolving credit facility expiring in 2018 | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Applicable margin for base rate below LIBOR |  |  |  |  | 0.00% |  |  |  |  |
Revolving credit facility expiring in 2018 | Minimum [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Applicable margin rates |  |  |  |  | 0.10% |  |  |  |  |
Revolving credit facility expiring in 2014 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Revolving credit facilities |  |  |  |  | $ 2,000,000,000.0 |  |  |  |  |
Line of Credit Facility, Fair Value of Amount Outstanding |  |  |  |  | $ 0 |  |  |  |  |
Revolving credit facility expiring in 2014 | LIBOR [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Applicable margin rates |  |  |  |  | 100.00% |  |  |  |  |
Revolving credit facility expiring in 2014 | Federal funds effective rate |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Applicable margin rates |  |  |  |  | 50.00% |  |  |  |  |
Revolving credit facility expiring in 2014 | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Applicable margin for base rate below LIBOR |  |  |  |  | 1.00% |  |  |  |  |
Revolving credit facility expiring in 2014 | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Applicable margin for base rate below LIBOR |  |  |  |  | 0.00% |  |  |  |  |
U.S. Commercial Paper Program |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Commercial paper program, authorized to borrow |  |  |  |  | $ 10,000,000,000.0 |  |  |  |  |
U.S. Commercial Paper Program | Commercial paper |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  | $ 15,000,000 |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  |  | 0.17% |  |  | 0.17% | 0.17% | 0.17%
2.125% canadian senior notes | Canadian Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, stated interest rate percentage |  |  |  |  | 2.125% |  |  | 2.125% | 2.125% | 2.125%
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | $ 750
2.125% canadian senior notes | Canadian Senior Notes | Government of Canada Yield |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Applicable margin rates |  |  |  | 2150.00% |  |  |  |  |  |
Facility Notes and Bonds Worldport Louisville |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Average interest rate |  |  |  |  | 0.50% | 1.49% |  |  |  |
Principal Balance |  |  |  |  | $ 149,000,000 |  |  |  |  |
Floating Rate Euro Senior Notes | Euro Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt and Lease Obligation |  |  |  |  | 0 | $ 559,000,000 |  |  |  |
Repayments of Debt | $ 500,000,000 |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 0 |  |  |  |  |
Floating Rate Senior Notes Due 2020 | Euro Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of Debt | $ 566,000,000 |  |  |  |  |  |  |  |  |
8.375% debentures Due 2020 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, average swaption interest rate |  |  |  |  | 6.66% | 7.20% |  | 6.66% | 6.66% | 6.66%
Debt not subject to early redemption |  |  |  |  | $ 424,000,000 |  |  |  |  |
8.375% debentures Due 2020 | Senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, stated interest rate percentage |  |  |  |  | 8.375% |  |  | 8.375% | 8.375% | 8.375%
Long-term Debt and Lease Obligation |  |  |  |  | $ 0 | $ 426,000,000 |  |  |  |
Repayments of Debt |  | $ 424,000,000 |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 0 |  |  |  |  |
8.375% Debentures |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, stated interest rate percentage |  |  |  |  | 837.50% |  |  | 837.50% | 837.50% | 837.50%
8.375% debentures Due 2030 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Original debt amount |  |  |  |  | $ 276,000,000 |  |  |  |  |
Debt instrument redemption price |  |  |  |  | 100.00% |  |  | 100.00% | 100.00% | 100.00%
8.375% debentures Due 2030 | Until April 1, 2020 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, stated interest rate percentage |  |  |  |  | 8.375% |  |  | 8.375% | 8.375% | 8.375%
8.375% debentures Due 2030 | After April 1, 2020 for the Final 10 Years |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, stated interest rate percentage |  |  |  |  | 7.62% |  |  | 7.62% | 7.62% | 7.62%
Debt instrument, period that interest rate is reduced to 7.62% |  |  |  |  | 10 years |  |  |  |  |
8.375% debentures Due 2030 | Senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, stated interest rate percentage |  |  |  |  | 8.375% |  |  | 8.375% | 8.375% | 8.375%
Long-term Debt and Lease Obligation |  |  |  |  | $ 281,000,000 | 281,000,000 |  |  |  |
Debt instrument, face amount |  |  |  |  | 276,000,000 |  |  |  |  |
Floating rate senior notes maturing 2049-2067 | Senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt and Lease Obligation |  |  |  |  | $ 1,027,000,000 | $ 1,028,000,000 |  |  |  |
Average interest rate |  |  |  |  | 0.40% | 2.05% |  |  |  |
Senior notes earliest callable period |  |  |  |  | 30 years |  |  |  |  |
Senior notes earliest putable period |  |  |  |  | 1 year |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 1,039,000,000 |  |  |  |  |
Floating rate senior notes maturing 2049-2067 | Senior notes | Maximum [Member] | LIBOR |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Applicable margin rates |  |  |  |  | 0.45% |  |  |  |  |
Floating rate senior notes maturing 2049-2067 | Senior notes | Minimum [Member] | LIBOR |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Applicable margin rates |  |  |  |  | 0.30% |  |  |  |  |
Floating rate senior notes maturing 2021 | Senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt and Lease Obligation |  |  |  |  | $ 350,000,000 | $ 349,000,000 |  |  |  |
Debt instrument, face amount |  |  |  |  | 350,000,000 |  |  |  |  |
Foreign Commercial Paper Program |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Commercial paper program, authorized to borrow | € |  |  |  |  |  |  |  | € 5,000,000,000.0 |  |
Foreign Commercial Paper Program | Commercial paper |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  | $ 0 |  |  |  |  |
Facility Notes and Bonds Airfreight Louisville |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Average interest rate |  |  |  |  | 0.56% | 1.49% |  |  |  |
Principal Balance |  |  |  |  | $ 42,000,000 |  |  |  |  |
Facility Notes and Bonds International Airport Dallas Fort Worth |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal Balance |  |  |  |  | $ 29,000,000 |  |  |  |  |
Fixed interest rate |  |  |  |  | 5.11% |  |  | 5.11% | 5.11% | 5.11%
Facility Notes and Bonds, Delaware County, Pennsylvania Industrial Development Authority, Due September 2045 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Average interest rate |  |  |  |  | 0.62% | 1.48% |  |  |  |
Principal Balance |  |  |  |  | $ 100,000,000 |  |  |  |  |
5.50% Pound Sterling Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of tranches in debt instrument | Tranches |  |  |  |  | 2 |  |  |  |  |
Pound Sterling notes not exchanged | £ |  |  |  |  |  |  |  |  | £ 66 |
5.13% Pound Sterling Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, stated interest rate percentage |  |  |  |  | 5.125% |  |  | 5.125% | 5.125% | 5.125%
Pound Sterling notes not exchanged | £ |  |  |  |  |  |  |  |  | £ 455 |
5.50% senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, stated interest rate percentage |  |  |  |  | 5.50% |  |  | 5.50% | 5.50% | 5.50%
1.000% euro senior notes | Euro Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, stated interest rate percentage |  |  |  |  | 1.00% |  |  | 1.00% | 1.00% | 1.00%
Debt Instrument, Redemption Price, Percentage |  |  |  |  | 100.00% |  |  |  |  |
Long-term Debt and Lease Obligation |  |  |  |  | $ 611,000,000 | $ 556,000,000 |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 614,000,000 |  |  | € 500,000,000 |  |
1.000% euro senior notes | Euro Senior Notes | German Government |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Applicable margin rates |  |  | 0.15% |  |  |  |  |  |  |
Euro Senior Notes Due November 2025 | Senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, stated interest rate percentage |  |  |  |  | 1.625% |  |  | 1.625% | 1.625% | 1.625%
Debt Instrument, Redemption Price, Percentage |  |  |  |  | 100.00% |  |  |  |  |
Applicable margin rates |  |  | 0.20% |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 700,000,000 |  |  |  |  |
0.375% Euro Senior Notes | Euro Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, stated interest rate percentage |  |  |  |  | 0.375% |  |  | 0.375% | 0.375% | 0.375%
Long-term Debt and Lease Obligation |  |  |  |  | $ 857,000,000 | 779,000,000 |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 860,000,000 |  |  | € 700,000,000 |  |
0.375% Euro Senior Notes | Euro Senior Notes | Euro Government Yield |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Applicable margin rates |  |  | 0.10% |  |  |  |  |  |  |
1.500% euro senior notes | Euro Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, stated interest rate percentage |  |  |  |  | 1.50% |  |  | 1.50% | 1.50% | 1.50%
Long-term Debt and Lease Obligation |  |  |  |  | $ 611,000,000 | $ 556,000,000 |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 614,000,000 |  |  | € 500,000,000 |  |
1.500% euro senior notes | Euro Senior Notes | Euro Government Yield |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Applicable margin rates |  |  | 0.20% |  |  |  |  |  |  |

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