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DEBT AND FINANCING ARRANGEMENTS - Carrying Value of Outstanding Debt (Detail) - USD ($) | Apr. 01, 2020 | Sep. 30, 2021 | Apr. 01, 2021 | Jan. 15, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 22,274,000,000 |  |  |  |
Total debt |  | 22,106,000,000 |  |  | $ 24,654,000,000 |
Less current maturities |  | (1,268,000,000) |  |  | (2,623,000,000) |
Long-Term Debt and Finance Leases |  | 20,838,000,000 |  |  | 22,031,000,000 |
Senior notes | 3.125% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 0 |  |  |  |
Debt instrument, stated interest rate |  | 3.125% |  | 3.125% |  |
Total debt |  | $ 0 |  |  | 1,507,000,000 |
Senior notes | 2.050% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 0 |  |  |  |
Debt instrument, stated interest rate |  | 2.05% | 2.05% |  |  |
Total debt |  | $ 0 |  |  | 700,000,000 |
Senior notes | 2.450% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 1,000,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 2.45% |  |  |  |
Total debt |  | $ 1,016,000,000 |  |  | 1,028,000,000 |
Senior notes | 2.350% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 600,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 2.35% |  |  |  |
Total debt |  | $ 600,000,000 |  |  | 599,000,000 |
Senior notes | 2.500% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 1,000,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 2.50% |  |  |  |
Total debt |  | $ 998,000,000 |  |  | 997,000,000 |
Senior notes | 2.800% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 500,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 2.80% |  |  |  |
Total debt |  | $ 498,000,000 |  |  | 498,000,000 |
Senior notes | 2.200% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 400,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 2.20% |  |  |  |
Total debt |  | $ 399,000,000 |  |  | 398,000,000 |
Senior notes | 3.900% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 1,000,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 3.90% |  |  |  |
Total debt |  | $ 996,000,000 |  |  | 995,000,000 |
Senior notes | 2.400% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 500,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 2.40% |  |  |  |
Total debt |  | $ 498,000,000 |  |  | 498,000,000 |
Senior notes | 3.050% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 1,000,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 3.05% |  |  |  |
Total debt |  | $ 994,000,000 |  |  | 993,000,000 |
Senior notes | 3.400% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 750,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 3.40% |  |  |  |
Total debt |  | $ 746,000,000 |  |  | 746,000,000 |
Senior notes | 2.500% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 400,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 2.50% |  |  |  |
Total debt |  | $ 397,000,000 |  |  | 397,000,000 |
Senior notes | 4.450% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 750,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 4.45% |  |  |  |
Total debt |  | $ 743,000,000 |  |  | 743,000,000 |
Senior notes | 6.200% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 1,500,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 6.20% |  |  |  |
Total debt |  | $ 1,484,000,000 |  |  | 1,483,000,000 |
Senior notes | 5.200% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 500,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 5.20% |  |  |  |
Total debt |  | $ 494,000,000 |  |  | 493,000,000 |
Senior notes | 4.875% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 500,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 4.875% |  |  |  |
Total debt |  | $ 491,000,000 |  |  | 490,000,000 |
Senior notes | 3.625% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 375,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 3.625% |  |  |  |
Total debt |  | $ 368,000,000 |  |  | 368,000,000 |
Senior notes | 3.400% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 500,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 3.40% |  |  |  |
Total debt |  | $ 492,000,000 |  |  | 491,000,000 |
Senior notes | 3.750% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 1,150,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 3.75% |  |  |  |
Total debt |  | $ 1,137,000,000 |  |  | 1,137,000,000 |
Senior notes | 4.250% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 750,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 4.25% |  |  |  |
Total debt |  | $ 743,000,000 |  |  | 742,000,000 |
Senior notes | 3.400% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 700,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 3.40% |  |  |  |
Total debt |  | $ 688,000,000 |  |  | 688,000,000 |
Senior notes | 5.300% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 1,250,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 5.30% |  |  |  |
Total debt |  | $ 1,231,000,000 |  |  | 1,231,000,000 |
Senior notes | Floating-rate senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | 0 |  |  |  |
Total debt |  | 0 |  |  | 350,000,000 |
Senior notes | Floating-rate senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | 400,000,000 |  |  |  |
Total debt |  | 400,000,000 |  |  | 399,000,000 |
Senior notes | Floating-rate senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | 500,000,000 |  |  |  |
Total debt |  | 500,000,000 |  |  | 499,000,000 |
Senior notes | Floating-rate senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | 1,039,000,000 |  |  |  |
Total debt |  | 1,027,000,000 |  |  | 1,027,000,000 |
Senior notes | 7.620% debentures(1) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 276,000,000 |  |  |  |
Debt instrument, stated interest rate | 7.62% | 7.62% |  |  |  | 8.375%
Total debt |  | $ 280,000,000 |  |  | 281,000,000 |
Debt instrument, term | 10 years |  |  |  |  |
Senior notes | Canadian senior note 2.125% |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 588,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 2.125% |  |  |  |
Total debt |  | $ 586,000,000 |  |  | 583,000,000 |
Pound Sterling notes | 5.500% notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 89,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 5.50% |  |  |  |
Total debt |  | $ 88,000,000 |  |  | 90,000,000 |
Pound Sterling notes | 5.125% notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 612,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 5.125% |  |  |  |
Total debt |  | $ 581,000,000 |  |  | 586,000,000 |
Euro Senior Notes | 0.375% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 811,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 0.375% |  |  |  |
Total debt |  | $ 808,000,000 |  |  | 857,000,000 |
Euro Senior Notes | 1.625% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 811,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 1.625% |  |  |  |
Total debt |  | $ 807,000,000 |  |  | 856,000,000 |
Euro Senior Notes | 1.000% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 579,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 1.00% |  |  |  |
Total debt |  | $ 576,000,000 |  |  | 611,000,000 |
Euro Senior Notes | 1.500% senior notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 579,000,000 |  |  |  |
Debt instrument, stated interest rate |  | 1.50% |  |  |  |
Total debt |  | $ 575,000,000 |  |  | 611,000,000 |
Facility notes and bonds |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | 320,000,000 |  |  |  |
Total debt |  | 320,000,000 |  |  | 320,000,000 |
Other debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | 3,000,000 |  |  |  |
Total debt |  | $ 3,000,000 |  |  | $ 5,000,000 |

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