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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2026
Fair Value Disclosures [Abstract] |
Schedule of Fair Value Level Input and Input Definitions | Assets and liabilities recorded at fair value in the Consolidated Balance Sheets are categorized based upon observable or unobservable inputs used to estimate fair value. Level inputs are as follows:
Level Input: |  | Input Definition:
Level I |  | Inputs are unadjusted, quoted prices for identical assets or liabilities in active markets at the measurement date.
Level II |  | Inputs other than quoted prices included in Level I that are observable for the asset or liability through corroboration with market data at the measurement date.
Level III |  | Unobservable inputs that reflect management's best estimate of what market participants would use in pricing the asset or liability at the measurement date.
Schedule of Fair Value Measurements by Level for Assets Measured at Fair Value on a Recurring Basis | The following table summarizes fair value measurements by level at March 31, 2026, for assets and liabilities measured at fair value on a recurring basis ($ in millions):
| Level I |  | Level II |  | Level III |  | Total
Assets |  |  |  |  |  |  |
Cash and cash equivalents | $ | 21,264 |  |  | $ | — |  |  | $ | — |  |  | $ | 21,264 |
Investments: |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies | $ | 53 |  |  | $ | — |  |  | $ | — |  |  | $ | 53 |
Corporate securities | — |  |  | 10,558 |  |  | — |  |  | 10,558 |
Municipal securities | — |  |  | 2,860 |  |  | — |  |  | 2,860 |
Short-term time deposits | — |  |  | 68 |  |  | — |  |  | 68 |
Asset-backed securities | — |  |  | 1,612 |  |  | — |  |  | 1,612 |
Residential mortgage-backed securities | — |  |  | 1,703 |  |  | — |  |  | 1,703 |
Commercial mortgage-backed securities | — |  |  | 1,115 |  |  | — |  |  | 1,115 |
Equity securities | — |  |  | 1 |  |  | — |  |  | 1 |
Total investments | $ | 53 |  |  | $ | 17,917 |  |  | $ | — |  |  | $ | 17,970 |
Restricted deposits: |  |  |  |  |  |  |
Cash and cash equivalents | $ | 89 |  |  | $ | — |  |  | $ | — |  |  | $ | 89 |
U.S. Treasury securities and obligations of U.S. government corporations and agencies | 479 |  |  | — |  |  | — |  |  | 479 |
Corporate securities | — |  |  | 34 |  |  | — |  |  | 34 |
Certificates of deposit | — |  |  | 1 |  |  | — |  |  | 1 |
Municipal securities | — |  |  | 829 |  |  | — |  |  | 829 |
Total restricted deposits | $ | 568 |  |  | $ | 864 |  |  | $ | — |  |  | $ | 1,432 |
Total assets at fair value | $ | 21,885 |  |  | $ | 18,781 |  |  | $ | — |  |  | $ | 40,666 |
The following table summarizes fair value measurements by level at December 31, 2025, for assets and liabilities measured at fair value on a recurring basis ($ in millions):
| Level I |  | Level II |  | Level III |  | Total
Assets |  |  |  |  |  |  |
Cash and cash equivalents | $ | 17,888 |  |  | $ | — |  |  | $ | — |  |  | $ | 17,888 |
Investments: |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies | $ | 55 |  |  | $ | — |  |  | $ | — |  |  | $ | 55 |
Corporate securities | — |  |  | 10,652 |  |  | — |  |  | 10,652 |
Municipal securities | — |  |  | 2,906 |  |  | — |  |  | 2,906 |
Short-term time deposits | — |  |  | 205 |  |  | — |  |  | 205 |
Asset-backed securities | — |  |  | 1,666 |  |  | — |  |  | 1,666 |
Residential mortgage-backed securities | — |  |  | 1,714 |  |  | — |  |  | 1,714 |
Commercial mortgage-backed securities | — |  |  | 1,136 |  |  | — |  |  | 1,136 |
Equity securities | — |  |  | 1 |  |  | — |  |  | 1 |
Total investments | $ | 55 |  |  | $ | 18,280 |  |  | $ | — |  |  | $ | 18,335 |
Restricted deposits: |  |  |  |  |  |  |
Cash and cash equivalents | $ | 69 |  |  | $ | — |  |  | $ | — |  |  | $ | 69 |
U.S. Treasury securities and obligations of U.S. government corporations and agencies | 480 |  |  | — |  |  | — |  |  | 480 |
Corporate securities | — |  |  | 10 |  |  | — |  |  | 10 |
Certificates of deposit | — |  |  | 1 |  |  | — |  |  | 1 |
Municipal securities | — |  |  | 852 |  |  | — |  |  | 852 |
Total restricted deposits | $ | 549 |  |  | $ | 863 |  |  | $ | — |  |  | $ | 1,412 |
Total assets at fair value | $ | 18,492 |  |  | $ | 19,143 |  |  | $ | — |  |  | $ | 37,635 |

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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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