XML 68 R43.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Investments (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2024
Regulated Entity, Other Assets, Noncurrent [Abstract] |
Summary of Amortized Cost and Fair Value of the Trust Investments | The following table sets forth amortized cost and fair value of the trust investments (see Note 4 for a discussion on fair value of the trust investments):
|  |  | Amortized Costs |  | Fair Values
(in millions) | Longest Maturity Dates |  | December 31, 2024 |  | December 31, 2023 |  | December 31, 2024 |  | December 31, 2023
Municipal bonds | 2067 |  | $ | 729 |  |  | $ | 636 |  |  | $ | 860 |  |  | $ | 757 |
Government and agency securities | 2074 |  | 1,201 |  |  | 1,072 |  |  | 1,341 |  |  | 1,186 |
Corporate bonds | 2072 |  | 346 |  |  | 361 |  |  | 392 |  |  | 401 |
Short-term investments and receivables/payables 1 | One-year |  | 152 |  |  | 164 |  |  | 62 |  |  | 171 |
Total debt securities and other |  |  | 2,428 |  |  | 2,233 |  |  | 2,655 |  |  | 2,515 |
Equity securities |  |  |  |  |  |  | 1,631 |  |  | 1,658 |
Total 2 |  |  |  |  |  |  | $ | 4,286 |  |  | $ | 4,173 |
1 Short-term investments include $18 million and $38 million of repurchase agreements payable by financial institutions which earn interest, were both fully secured by U.S. Treasury securities and mature by January 2, 2025 and January 2, 2024 as of December 31, 2024 and 2023, respectively. 2Represents amounts before reduction for deferred tax liabilities on net unrealized gains of $373 million and $380 million as of December 31, 2024 and 2023, respectively.
Summary of Gains and Losses | The following table summarizes the gains and losses for the trust investments:
| Years ended December 31,
(in millions) | 2024 |  | 2023 |  | 2022
Gross realized gains | $ | 326 |  |  | $ | 323 |  |  | $ | 150 |
Gross realized losses | (24) |  |  | (73) |  |  | (127) |
Net unrealized (losses) gains for equity securities | (19) |  |  | 103 |  |  | (369) |

X
- Definition Tabular disclosure of realized and unrealized gain (loss) on investment in security. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(9)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
Name: | us-gaap_GainLossOnInvestmentsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_RegulatedEntityOtherAssetsNoncurrentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration