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DEBT AND FINANCING ARRANGEMENTS - Carrying Value of Debt Obligations (Detail) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 EUR (€) | Mar. 24, 2020 USD ($) | Dec. 31, 2019 USD ($)
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Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 24,814,000,000 |  |  |
Long-term Debt | 24,472,000,000 |  |  |
Long-term Debt and Lease Obligation, Total | 24,654,000,000 |  |  | $ 25,238,000,000
Total lease obligations | 342,000,000 |  |  | 498,000,000
Less current maturities | (2,623,000,000) |  |  | (3,420,000,000)
Long-term debt, excluding current maturities | 22,031,000,000 |  |  | 21,818,000,000
Commercial paper |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | 15,000,000 |  |  |
Long-term Debt and Lease Obligation, Total | 15,000,000 |  |  | 3,234,000,000
Senior notes | 5.125% senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 1,000,000,000 |  |  |
Debt instrument, stated interest rate percentage | 5.125% | 5.125% |  |
Senior notes | 3.125% senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 1,500,000,000 |  |  |
Debt instrument, stated interest rate percentage | 3.125% | 3.125% |  |
Long-term Debt and Lease Obligation, Total | $ 1,507,000,000 |  |  | 1,524,000,000
Senior notes | 2.050% senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 700,000,000 |  |  |
Debt instrument, stated interest rate percentage | 2.05% | 2.05% |  |
Long-term Debt and Lease Obligation, Total | $ 700,000,000 |  |  | 699,000,000
Senior notes | 2.45% senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 1,000,000,000 |  |  |
Debt instrument, stated interest rate percentage | 2.45% | 2.45% |  |
Long-term Debt and Lease Obligation, Total | $ 1,028,000,000 |  |  | 1,003,000,000
Senior notes | A235 Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 600,000,000 |  |  |
Debt instrument, stated interest rate percentage | 2.35% | 2.35% |  |
Long-term Debt and Lease Obligation, Total | $ 599,000,000 |  |  | 598,000,000
Senior notes | 2.500% senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 1,000,000,000 |  |  |
Debt instrument, stated interest rate percentage | 2.50% | 2.50% |  |
Long-term Debt and Lease Obligation, Total | $ 997,000,000 |  |  | 995,000,000
Senior notes | 2.800% senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 500,000,000 |  |  |
Debt instrument, stated interest rate percentage | 2.80% | 2.80% |  |
Long-term Debt and Lease Obligation, Total | $ 498,000,000 |  |  | 497,000,000
Senior notes | 2.20% senior notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 400,000,000 |  |  |
Debt instrument, stated interest rate percentage | 2.20% | 2.20% |  |
Long-term Debt and Lease Obligation, Total | $ 398,000,000 |  |  | 398,000,000
Senior notes | 3.900% senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 1,000,000,000 |  | $ 1,000,000,000.0 |
Debt instrument, stated interest rate percentage | 3.90% | 3.90% | 3.90% |
Long-term Debt and Lease Obligation, Total | $ 995,000,000 |  |  | 0
Senior notes | 2.40% senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 500,000,000 |  |  |
Debt instrument, stated interest rate percentage | 2.40% | 2.40% |  |
Long-term Debt and Lease Obligation, Total | $ 498,000,000 |  |  | 498,000,000
Senior notes | 3.050% senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 1,000,000,000 |  |  |
Debt instrument, stated interest rate percentage | 3.05% | 3.05% |  |
Long-term Debt and Lease Obligation, Total | $ 993,000,000 |  |  | 992,000,000
Senior notes | 3.400% senior notes Due 2029 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 750,000,000 |  |  |
Debt instrument, stated interest rate percentage | 3.40% | 3.40% |  |
Long-term Debt and Lease Obligation, Total | $ 746,000,000 |  |  | 745,000,000
Senior notes | 2.500% senior notes Due 2029 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 400,000,000 |  |  |
Debt instrument, stated interest rate percentage | 2.50% | 2.50% |  |
Long-term Debt and Lease Obligation, Total | $ 397,000,000 |  |  | 397,000,000
Senior notes | 4.450% senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 750,000,000 |  | $ 750,000,000 |
Debt instrument, stated interest rate percentage | 4.45% | 4.45% | 4.45% |
Long-term Debt and Lease Obligation, Total | $ 743,000,000 |  |  | 0
Senior notes | 6.20% senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 1,500,000,000 |  |  |
Debt instrument, stated interest rate percentage | 6.20% | 6.20% |  |
Long-term Debt and Lease Obligation, Total | $ 1,483,000,000 |  |  | 1,483,000,000
Senior notes | 5.200% senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 500,000,000 |  | $ 500,000,000 |
Debt instrument, stated interest rate percentage | 5.20% | 5.20% | 5.20% |
Long-term Debt and Lease Obligation, Total | $ 493,000,000 |  |  | 0
Senior notes | 4.875% senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 500,000,000 |  |  |
Debt instrument, stated interest rate percentage | 4.875% | 4.875% |  |
Long-term Debt and Lease Obligation, Total | $ 490,000,000 |  |  | 490,000,000
Senior notes | 3.625% senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 375,000,000 |  |  |
Debt instrument, stated interest rate percentage | 3.625% | 3.625% |  |
Long-term Debt and Lease Obligation, Total | $ 368,000,000 |  |  | 368,000,000
Senior notes | 3.40% senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 500,000,000 |  |  |
Debt instrument, stated interest rate percentage | 3.40% | 3.40% |  |
Long-term Debt and Lease Obligation, Total | $ 491,000,000 |  |  | 491,000,000
Senior notes | 3.750% senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 1,150,000,000 |  |  |
Debt instrument, stated interest rate percentage | 3.75% | 3.75% |  |
Long-term Debt and Lease Obligation, Total | $ 1,137,000,000 |  |  | 1,136,000,000
Senior notes | 4.250% senior notes 2049 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 750,000,000 |  |  |
Debt instrument, stated interest rate percentage | 4.25% | 4.25% |  |
Long-term Debt and Lease Obligation, Total | $ 742,000,000 |  |  | 742,000,000
Senior notes | 3.400% senior notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 700,000,000 |  |  |
Debt instrument, stated interest rate percentage | 3.40% | 3.40% |  |
Long-term Debt and Lease Obligation, Total | $ 688,000,000 |  |  | 688,000,000
Senior notes | 5.300% senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 1,250,000,000 |  | $ 1,250,000,000 |
Debt instrument, stated interest rate percentage | 5.30% | 5.30% | 5.30% |
Long-term Debt and Lease Obligation, Total | $ 1,231,000,000 |  |  | 0
Senior notes | Floating rate senior notes maturing 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | 350,000,000 |  |  |
Long-term Debt and Lease Obligation, Total | 350,000,000 |  |  | 349,000,000
Senior notes | Floating rate senior notes maturing 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | 400,000,000 |  |  |
Long-term Debt and Lease Obligation, Total | 399,000,000 |  |  | 399,000,000
Senior notes | Floating rate senior notes maturing 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | 500,000,000 |  |  |
Long-term Debt and Lease Obligation, Total | 499,000,000 |  |  | 499,000,000
Senior notes | Floating rate senior notes maturing 2049-2067 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | 1,039,000,000 |  |  |
Long-term Debt and Lease Obligation, Total | 1,027,000,000 |  |  | 1,028,000,000
Senior notes | 8.375% debentures Due 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 0 |  |  |
Debt instrument, stated interest rate percentage | 8.375% | 8.375% |  |
Long-term Debt and Lease Obligation, Total | $ 0 |  |  | 426,000,000
Senior notes | 8.375% debentures Due 2030 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 276,000,000 |  |  |
Debt instrument, stated interest rate percentage | 8.375% | 8.375% |  |
Long-term Debt and Lease Obligation, Total | $ 281,000,000 |  |  | 281,000,000
Senior notes | Canadian Senior Note 2.125 Note [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 585,000,000 |  |  |
Debt instrument, stated interest rate percentage | 2.125% | 2.125% |  |
Long-term Debt and Lease Obligation, Total | $ 583,000,000 |  |  | 571,000,000
Pound Sterling notes | 5.50% Pound Sterling Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 90,000,000 |  |  |
Debt instrument, stated interest rate percentage | 5.50% | 5.50% |  |
Long-term Debt and Lease Obligation, Total | $ 90,000,000 |  |  | 86,000,000
Pound Sterling notes | Pound Sterling Notes 5 Point 13 Percent [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 618,000,000 |  |  |
Debt instrument, stated interest rate percentage | 5.125% | 5.125% |  |
Long-term Debt and Lease Obligation, Total | $ 586,000,000 |  |  | 566,000,000
Euro Senior Notes | 0.375% Euro Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 860,000,000 | € 700,000,000 |  |
Debt instrument, stated interest rate percentage | 0.375% | 0.375% |  |
Long-term Debt and Lease Obligation, Total | $ 857,000,000 |  |  | 779,000,000
Euro Senior Notes | 1.625% euro senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 860,000,000 |  |  |
Debt instrument, stated interest rate percentage | 1.625% | 1.625% |  |
Long-term Debt and Lease Obligation, Total | $ 856,000,000 |  |  | 779,000,000
Euro Senior Notes | 1.000% euro senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 614,000,000 | € 500,000,000 |  |
Debt instrument, stated interest rate percentage | 1.00% | 1.00% |  |
Long-term Debt and Lease Obligation, Total | $ 611,000,000 |  |  | 556,000,000
Euro Senior Notes | 1.500% euro senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | $ 614,000,000 | € 500,000,000 |  |
Debt instrument, stated interest rate percentage | 1.50% | 1.50% |  |
Long-term Debt and Lease Obligation, Total | $ 611,000,000 |  |  | 556,000,000
Euro Senior Notes | Floating Rate Euro Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | 0 |  |  |
Long-term Debt and Lease Obligation, Total | 0 |  |  | 559,000,000
Facility notes and bonds [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | 320,000,000 |  |  |
Long-term Debt and Lease Obligation, Total | 320,000,000 |  |  | 320,000,000
Other debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Amount | 6,000,000 |  |  |
Long-term Debt and Lease Obligation, Total | $ 5,000,000 |  |  | $ 8,000,000

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