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Derivative Financial Instruments - Change in the Fair Value for Interest Rate Contracts and the Related Hedged Items (Details) - Fair Value Hedging - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025
Available-for-sale debt and other securities |  |  |  |  |
Derivatives, Fair Value |  |  |  |  |
Cumulative amount of fair value hedging adjustments remaining for hedged items for which hedge accounting has been discontinued | $ (7) |  | $ (7) |  | $ (7)
Long-term debt |  |  |  |  |
Derivatives, Fair Value |  |  |  |  |
Carrying amount of the hedged items | 7,280 |  | 7,280 |  | 4,204
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items | (55) |  | (55) |  | $ 10
Interest rate contracts | Income Statement Location [Axis]: us-gaap:InterestExpenseLongTermDebt |  |  |  |  |
Derivatives, Fair Value |  |  |  |  |
Change in fair value of interest rate swaps hedging long-term debt | (45) | $ 37 | (64) | $ 105 |
Change in fair value of hedged long-term debt attributable to the risk being hedged | $ 45 | $ (37) | $ 65 | $ (105) |

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- Definition Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk, remaining after discontinued hedge. Excludes cumulative basis adjustment related to foreign exchange risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4EE -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4EE Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 181 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-181 + Details
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- Definition Amount of unrealized gain (loss) included in earnings related to the fair value of the hedged item in an interest rate fair value hedge, offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A + Details
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