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Fair Value (Tables) | 9 Months Ended
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Sep. 30, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Financial Assets and Liabilities, Measured at Fair Value Recurring Basis [Table Text Block] | The following table presents a summary of fair value measurements by level and carrying values for items measured at fair value on a recurring basis in the Condensed Consolidated Balance Sheets:
(in millions) |  | Quoted Prices in Active Markets (Level 1) |  | Other Observable Inputs (Level 2) |  | Unobservable Inputs (Level 3) |  | Total Fair and Carrying Value
September 30, 2025 |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 21,305 |  | $ | 5,905 |  | $ | — |  | $ | 27,210
Debt securities - available-for-sale: |  |  |  |  |  |  |  |
U.S. government and agency obligations |  | 3,561 |  | 167 |  | — |  | 3,728
State and municipal obligations |  | — |  | 6,494 |  | — |  | 6,494
Corporate obligations |  | — |  | 23,842 |  | 467 |  | 24,309
U.S. agency mortgage-backed securities |  | — |  | 9,632 |  | — |  | 9,632
Non-U.S. agency mortgage-backed securities |  | — |  | 2,659 |  | — |  | 2,659
Total debt securities - available-for-sale |  | 3,561 |  | 42,794 |  | 467 |  | 46,822
Equity securities |  | 2,023 |  | 214 |  | 207 |  | 2,444
Total assets at fair value |  | $ | 26,889 |  | $ | 48,913 |  | $ | 674 |  | $ | 76,476
Percentage of total assets at fair value |  | 35 | % |  | 64 | % |  | 1 | % |  | 100 | %
December 31, 2024 |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 25,248 |  | $ | 64 |  | $ | — |  | $ | 25,312
Debt securities - available-for-sale: |  |  |  |  |  |  |  |
U.S. government and agency obligations |  | 4,194 |  | 133 |  | — |  | 4,327
State and municipal obligations |  | — |  | 6,984 |  | — |  | 6,984
Corporate obligations |  | 29 |  | 22,841 |  | 437 |  | 23,307
U.S. agency mortgage-backed securities |  | — |  | 9,584 |  | — |  | 9,584
Non-U.S. agency mortgage-backed securities |  | — |  | 2,717 |  | — |  | 2,717
Total debt securities - available-for-sale |  | 4,223 |  | 42,259 |  | 437 |  | 46,919
Equity securities |  | 1,859 |  | 24 |  | 65 |  | 1,948
Total assets at fair value |  | $ | 31,330 |  | $ | 42,347 |  | $ | 502 |  | $ | 74,179
Percentage of total assets at fair value |  | 42 | % |  | 57 | % |  | 1 | % |  | 100 | %
Fair Value Measurements, Nonrecurring [Table Text Block] | The following table presents a summary of fair value measurements by level and carrying values for certain financial instruments not measured at fair value on a recurring basis in the Condensed Consolidated Balance Sheets:
(in millions) |  | Quoted Prices in Active Markets (Level 1) |  | Other Observable Inputs (Level 2) |  | Unobservable Inputs (Level 3) |  | Total Fair Value |  | Total Carrying Value
September 30, 2025 |  |  |  |  |  |  |  |  |  |
Debt securities - held-to-maturity |  | $ | 461 |  |  | $ | 25 |  |  | $ | — |  |  | $ | 486 |  |  | $ | 488 |
Long-term debt and other financing obligations |  | $ | — |  |  | $ | 73,627 |  |  | $ | — |  |  | $ | 73,627 |  |  | $ | 77,247 |
December 31, 2024 |  |  |  |  |  |  |  |  |  |
Debt securities - held-to-maturity |  | $ | 482 |  |  | $ | 26 |  |  | $ | — |  |  | $ | 508 |  |  | $ | 512 |
Long-term debt and other financing obligations |  | $ | — |  |  | $ | 70,565 |  |  | $ | — |  |  | $ | 70,565 |  |  | $ | 75,604 |

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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