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Debt - Classification and Utilization (Detail) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 28, 2020 | Nov. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Debt |  |  |  |  |
Debt maturing or subject to remarketing within twelve months |  |  | $ 3,300 | $ 3,300 |
Current portion of long-term debt |  |  | 551 | 551 | $ 218
Loss on early extinguishment of debt, net |  |  |  | (53) | $ (85)
4.60% senior notes due March 2021 [Member] |  |  |  |  |
Debt |  |  |  |  |
Interest rate (as a percent) |  | 4.60% |  |  |
Tax Exempt Bonds [Member] |  |  |  |  |
Debt |  |  |  |  |
Current portion of long-term debt |  |  | 127 | 127 |
Debt with interest rate periods that expire in the next 12 months |  |  | 1,200 | 1,200 |
Debt classified as long-term due to intent and ability to refinance on long-term basis |  |  | 2,700 | 2,700 |
Variable-rate tax-exempt bonds |  |  | 54 | 54 |
Variable-rate tax-exempt bonds, non-current |  |  | $ 54 | $ 54 |
Tax Exempt Bonds [Member] | Minimum [Member] |  |  |  |  |
Debt |  |  |  |  |
Interest rate (as a percent) |  |  | 0.10% | 0.10% |
Tax Exempt Bonds [Member] | Maximum [Member] |  |  |  |  |
Debt |  |  |  |  |
Interest rate (as a percent) |  |  | 4.30% | 4.30% |
Financing leases and other [Member] |  |  |  |  |
Debt |  |  |  |  |
Current portion of long-term debt |  |  | $ 242 | $ 242 |
364-day revolving credit facility [Member] |  |  |  |  |
Debt |  |  |  |  |
Maximum capacity | $ 3,000 |  |  |  |
Debt term | 364 days |  |  |  |
Loss on early extinguishment of debt, net |  | $ (2) | (2) |  |
$3.5 billion revolving credit facility [Member] |  |  |  |  |
Debt |  |  |  |  |
Maximum capacity |  |  | 3,500 | 3,500 |
Outstanding borrowings under credit facility |  |  | 0 | 0 |
Letters of credit outstanding |  |  | 270 | 270 |
Unused and available credit capacity |  |  | 1,400 | 1,400 |
Credit Facility Revolving Canadian [Member] |  |  |  |  |
Debt |  |  |  |  |
Maximum capacity |  |  | 375 | 375 |
Commercial Paper Program [Member] |  |  |  |  |
Debt |  |  |  |  |
Current portion of long-term debt |  |  | 1,800 | $ 1,800 |
Debt term |  |  |  | 397 days |
Other Letter Of Credit Lines [Member] |  |  |  |  |
Debt |  |  |  |  |
Letters of credit outstanding |  |  | $ 566 | $ 566 |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12355-112629 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12317-112629 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. + References No definition available. + Details
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- Definition Amount of short-term borrowings, long-term debt and financing leases due or subject to remarketing within the next twelve months, including amounts classified as current and amounts classified as noncurrent due to intent and ability to refinance. + References No definition available. + Details
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