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Debt - Additional Information (Detail) - USD ($) |  | 9 Months Ended |
--- | --- | --- | ---
Aug. 25, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |
Interest rate under multi currency facility |  | LIBOR, NIBOR or CDOR plus 1.125% |
Capitalization ratio, Maximum |  | 60.00% |
Capitalization ratio, Actual |  | 27.40% |
Outstanding letters of credit issued |  | $ 0 |
Funds available under revolving credit facility |  | 2,000,000,000.0 |
Other debt |  | $ 60,000,000 | $ 9,000,000
Senior notes interest rate |  | 3.60% | 3.60%
Loss on extinguishment of debt |  | $ (8,000,000) |
Outstanding letters of credit under various bilateral letter of credit facilities |  | 490,000,000 |
Carrying value of Unsecured Senior Notes |  | 1,764,000,000 | $ 1,980,000,000
Unsecured Debt [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Fair value of Unsecured Senior Notes |  | 1,648,000,000 | $ 1,947,000,000
2.60% unsecured Senior Notes Due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayment of debt | $ 217,300,000 |  |
Senior notes interest rate | 2.60% |  |
Payment on redemption | $ 226,000,000 |  |
Premium on redemption | 7,600,000 |  |
Accrued and unpaid interest | 1,300,000 |  |
Loss on extinguishment of debt | 8,200,000 |  |
Premium on debt | 7,600,000 |  |
Non cash charges | $ 600,000 |  |
Noncontrolling Interests [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Other debt |  | $ 24,000,000 |
Canadian Dollar Offered Rate (CDOR) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Variable rate |  | 1.125% |
Five Year Unsecured Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility, borrowing capacity |  | $ 2,000,000,000.0 |
Credit facility, maturity date |  | Oct. 30, 2024 |
Credit facility, extendable borrowing capacity |  | $ 3,000,000,000.0 |
Variable rate basis |  | LIBOR, NIBOR or CDOR plus |
Unsecured Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility, Period |  | 5 years |
Foreign Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Variable rate |  | 1.40% |
Additional line of credit facility borrowing capacity |  | $ 150,000,000 |
Debt to equity ratio maximum |  | 75.00% |

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- Definition Accrued and unpaid interest on unsecured debt. + References No definition available. + Details
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- Definition Additional line of credit facility borrowing capacity. + References No definition available. + Details
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- Definition Interest rate under multicurrency facility. + References No definition available. + Details
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- Definition Line of credit facility covenant compliance debt to capitalization percentage. + References No definition available. + Details
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- Definition Line of credit facility covenant terms maximum debt to capitalization percentage. + References No definition available. + Details
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- Definition Line of credit facility covenant terms maximum debt to equity percentage. + References No definition available. + Details
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- Definition Line of credit facility extended borrowing capacity. + References No definition available. + Details
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- Definition Outstanding letters of credit under various bilateral committed letter of credit facilities. + References No definition available. + Details
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- Definition Payment on redemption unsecured debt. + References No definition available. + Details
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- Definition Premium on redemption of unsecured debt. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 + 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 Date the credit facility terminates, in CCYY-MM-DD format. + 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 Period remaining on line of credit facility before it terminates, 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 Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 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 fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Amount of long-term debt classified as other. + 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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: 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 + Details
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- Definition The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: 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(a)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 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 + Details
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