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Debt (Details) $ in Millions, $ in Millions |  |  |  |  |  | 3 Months Ended | 6 Months Ended |  |  |  |  |  |
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Jun. 12, 2025 CAD ($) | Apr. 29, 2025 CAD ($) | Apr. 29, 2025 USD ($) | Apr. 15, 2025 CAD ($) | Apr. 15, 2025 USD ($) | Mar. 27, 2025 CAD ($) | Mar. 27, 2025 USD ($) | Feb. 18, 2025 CAD ($) | Jun. 30, 2025 CAD ($) | Mar. 31, 2025 CAD ($) | Mar. 31, 2025 USD ($) | Jun. 30, 2024 CAD ($) | Jun. 30, 2025 CAD ($) | Jun. 30, 2024 CAD ($) | Jul. 02, 2025 CAD ($) | Jul. 02, 2025 USD ($) | Jun. 30, 2025 USD ($) | Apr. 14, 2025 CAD ($) | Apr. 14, 2025 USD ($) | Mar. 27, 2025 USD ($) | Feb. 18, 2025 USD ($) | Nov. 01, 2024 CAD ($) | Nov. 01, 2024 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Early repayments of non-current borrowings | $ 602 |  |  |  |  | $ 903 | $ 633 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on debt redemption |  |  |  |  |  |  |  |  | $ 91 | $ 266 |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  |  |  |  |  |  |  |  | 1,725 |  |  | $ 525 | $ 5,981 | $ 2,638 |  |  |  |  |  |  |  |  |
Repayments of lease liabilities |  |  |  |  |  |  |  |  | 278 |  |  | $ 270 | 582 | $ 567 |  |  |  |  |  |  |  |  |
Non-Committed Credit Facilities | Bell Mobility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, repurchase amount |  |  |  |  |  |  |  |  | $ 819 |  |  |  | $ 819 |  |  |  | $ 600 |  |  |  |  |  |
Series M-39 Medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, repurchase amount | 105 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings | 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series M-45 Medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, repurchase amount | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings | 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series M-51 Medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, repurchase amount | 35 |  |  |  |  | 1,131 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings | 119 |  |  |  |  | 1,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Early repayments of non-current borrowings |  |  |  |  |  | 896 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series M-55 Medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, repurchase amount | 460 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings | $ 550 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series US-2 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, repurchase amount |  |  |  |  |  | 249 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 174 |  |  |
Borrowings |  |  |  |  |  | 856 |  |  |  |  |  |  |  |  |  |  |  |  |  | 600 |  |  |
Series US-4 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, repurchase amount |  |  |  |  |  | 112 |  |  |  |  |  |  |  |  |  |  |  |  |  | 79 |  |  |
Borrowings |  |  |  |  |  | 713 |  |  |  |  |  |  |  |  |  |  |  |  |  | 500 |  |  |
Series US-5 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, repurchase amount |  |  |  |  |  | 261 |  |  |  |  |  |  |  |  |  |  |  |  |  | 183 |  |  |
Borrowings |  |  |  |  |  | 856 |  |  |  |  |  |  |  |  |  |  |  |  |  | 600 |  |  |
Series US-6 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, repurchase amount |  |  |  |  |  | 273 |  |  |  |  |  |  |  |  |  |  |  |  |  | 191 |  |  |
Borrowings |  |  |  |  |  | 927 |  |  |  |  |  |  |  |  |  |  |  |  |  | 650 |  |  |
Series US-7 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, repurchase amount |  |  |  |  |  | 310 |  |  |  |  |  |  |  |  |  |  |  |  |  | 217 |  |  |
Borrowings |  |  |  |  |  | 1,070 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750 |  |  |
Fixed-to-Fixed Rate Junior Subordinated Notes, Series C |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | $ 1,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, terms |  |  |  |  |  | 5 years | 5 years | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate, reset term |  |  |  |  |  | 5 years | 5 years | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, redemption price, percentage |  |  |  |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed-to-Fixed Rate Junior Subordinated Notes, Series A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  | $ 1,416 |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |
Fixed-to-Fixed Rate Junior Subordinated Notes, Series B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  | $ 1,771 |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,250 |  |
Borrowings, redemption price, percentage |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Committed Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 972 | $ 700 |  |  |  |
Proceeds from borrowings |  | $ 315 | $ 228 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Dollar Term Loan Facility | Bell Canada |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, trade loan agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,048 | $ 3,700
Increase (decrease) in borrowings, trade loan agreement |  |  |  | $ (314) | $ (225) |  |  |  |  | $ (1,387) | $ (965) |  |  |  |  |  |  |  |  |  |  |  |
U.S. Dollar Term Loan Facility | Bell Canada | Terminated Ziply Term Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, trade loan agreement, terminated |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,419 | $ 2,510 |  |  |  |  |  |  |
Fixed interest rate | Series M-39 Medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate | 4.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate | Series M-45 Medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate | 4.45% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate | Series M-51 Medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate | 3.50% |  |  |  |  | 3.50% |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.50% |  |  |
Fixed interest rate | Series M-55 Medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate | 4.05% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate | Series US-2 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  | 4.30% |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.30% |  |  |
Fixed interest rate | Series US-4 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  | 3.65% |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.65% |  |  |
Fixed interest rate | Series US-5 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  | 2.15% |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.15% |  |  |
Fixed interest rate | Series US-6 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  | 3.20% |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.20% |  |  |
Fixed interest rate | Series US-7 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  | 3.65% |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.65% |  |  |
Fixed interest rate | Fixed-to-Fixed Rate Junior Subordinated Notes, Series C |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  | 5.625% |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.625% |  |  |
Fixed interest rate | Fixed-to-Fixed Rate Junior Subordinated Notes, Series A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  | 6.875% |  |  |  |  |  |  |  |  |  |  |  |  | 6.875% |  |
Fixed interest rate | Fixed-to-Fixed Rate Junior Subordinated Notes, Series B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  | 7.00% |  |
Government of Canada yield plus a spread | Fixed-to-Fixed Rate Junior Subordinated Notes, Series C |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  | 2.95% |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.95% |  |  |
U.S. Treasury rate plus a spread | Fixed-to-Fixed Rate Junior Subordinated Notes, Series A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  |  |  | 2.39% |  |  |  |  |  |  |  |  |  |  |  |  | 2.39% |  |
U.S. Treasury rate plus a spread | Fixed-to-Fixed Rate Junior Subordinated Notes, Series B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  |  |  | 2.363% |  |  |  |  |  |  |  |  |  |  |  |  | 2.363% |  |

X
- Definition Borrowings, interest rate, reset term + References No definition available. + Details
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Namespace Prefix: | bce_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Borrowings, interest rate, term + References No definition available. + Details
Name: | bce_BorrowingsInterestRateTerm
Namespace Prefix: | bce_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Borrowings, Principal Amount, Repurchased + References No definition available. + Details
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Namespace Prefix: | bce_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Borrowings, Redemption Price, Percentage + References No definition available. + Details
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Namespace Prefix: | bce_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Borrowings, Trade Loan Agreement + References No definition available. + Details
Name: | bce_BorrowingsTradeLoanAgreement
Namespace Prefix: | bce_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Borrowings, Trade Loan Agreement, Terminated + References No definition available. + Details
Name: | bce_BorrowingsTradeLoanAgreementTerminated
Namespace Prefix: | bce_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Early repayments of non-current borrowings + References No definition available. + Details
Name: | bce_EarlyRepaymentsOfNonCurrentBorrowings
Namespace Prefix: | bce_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Gain (Loss) on Debt Redemption + References No definition available. + Details
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Namespace Prefix: | bce_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Increase (Decrease) In Borrowings, Trade Loan Agreement + References No definition available. + Details
Name: | bce_IncreaseDecreaseInBorrowingsTradeLoanAgreement
Namespace Prefix: | bce_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line Of Credit Facility, Maximum Borrowing Capacity1 + References No definition available. + Details
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Namespace Prefix: | bce_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Repayments of lease liabilities + References No definition available. + Details
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Namespace Prefix: | bce_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard -URIDate 2025-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_7&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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