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Debt - Additional Information (Detail) - USD ($) |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 09, 2021 | Apr. 08, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020
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 |  |  | 27.20% |  |
Funds available under revolving credit facility |  |  | $ 2,000,000,000.0 |  |
Other debt |  |  | 103,000,000 | $ 70,000,000 |
Loss on extinguishment of debt |  |  | (7,000,000) |  |
Outstanding letters of credit under various bilateral letter of credit facilities |  |  | 470,000,000 |  |
Carrying value of Unsecured Senior Notes |  |  | 1,583,000,000 | 1,764,000,000 |
2.60% Unsecured Senior Notes Due December 1, 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayment of unsecured note outstanding balance | $ 182,000,000 |  |  |  |
Senior notes interest rate | 2.60% |  |  |  |
Redemption of unsecured note | $ 191,000,000 |  |  |  |
Redemption premium | 6,800,000 |  |  |  |
Accrued and unpaid interest | $ 1,700,000 |  |  |  |
Loss on extinguishment of debt |  |  | (7,100,000) |  |
Premium |  |  | 6,800,000 |  |
Write off of unamortized discount and debt issuance cost |  |  | 300,000 |  |
Debt Instrument Maturity Date | 2029 |  |  |  |
Unsecured Debt [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fair value of Unsecured Senior Notes |  |  | $ 1,610,000,000 | $ 1,833,000,000 |
Noncontrolling Interests [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Other debt |  |  |  |  | $ 25,000,000
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 |  |
Outstanding letters of credit issued |  |  | $ 0 |  |
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% |  |
Revolving Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Funds available under revolving credit facility |  | $ 1,655,000,000 |  |  |
Line of credit facility extended maturity date |  | Oct. 30, 2025 |  |  |
Line of credit facility current borrowing capacity |  | $ 2,000,000,000.0 |  |  |

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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 Amount, after accumulated amortization, of debt premium. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399 + 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 Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any 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 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 cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest. + 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 (g) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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