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Fair Value Measurements - Schedule of Fair Value Measurements by Level for Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Assets |  |
Cash and cash equivalents | $ 21,264 | $ 17,888
Investments: |  |
Equity securities | 1 | 1
Total assets at fair value | 40,666 | 37,635
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Investments: |  |
Fair value | 532 | 535
Corporate securities |  |
Investments: |  |
Fair value | 10,592 | 10,662
Municipal securities |  |
Investments: |  |
Fair value | 3,689 | 3,758
Short-term time deposits |  |
Investments: |  |
Fair value | 68 | 205
Asset-backed securities |  |
Investments: |  |
Fair value | 1,612 | 1,666
Residential mortgage-backed securities |  |
Investments: |  |
Fair value | 1,703 | 1,714
Commercial mortgage-backed securities |  |
Investments: |  |
Fair value | 1,115 | 1,136
Level I |  |
Assets |  |
Cash and cash equivalents | 21,264 | 17,888
Investments: |  |
Total assets at fair value | 21,885 | 18,492
Level II |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Investments: |  |
Total assets at fair value | 18,781 | 19,143
Level III |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Investments: |  |
Total assets at fair value | 0 | 0
Investments: |  |
Investments: |  |
Fair value | 17,969 | 18,334
Total investments | 17,970 | 18,335
Investments: | U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Investments: |  |
Fair value | 53 | 55
Investments: | Corporate securities |  |
Investments: |  |
Fair value | 10,558 | 10,652
Investments: | Municipal securities |  |
Investments: |  |
Fair value | 2,860 | 2,906
Investments: | Short-term time deposits |  |
Investments: |  |
Fair value | 68 | 205
Investments: | Asset-backed securities |  |
Investments: |  |
Fair value | 1,612 | 1,666
Investments: | Residential mortgage-backed securities |  |
Investments: |  |
Fair value | 1,703 | 1,714
Investments: | Commercial mortgage-backed securities |  |
Investments: |  |
Fair value | 1,115 | 1,136
Investments: | Equity securities |  |
Investments: |  |
Equity securities | 1 | 1
Investments: | Level I |  |
Investments: |  |
Total investments | 53 | 55
Investments: | Level I | U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Investments: |  |
Fair value | 53 | 55
Investments: | Level I | Corporate securities |  |
Investments: |  |
Fair value | 0 | 0
Investments: | Level I | Municipal securities |  |
Investments: |  |
Fair value | 0 | 0
Investments: | Level I | Short-term time deposits |  |
Investments: |  |
Fair value | 0 | 0
Investments: | Level I | Asset-backed securities |  |
Investments: |  |
Fair value | 0 | 0
Investments: | Level I | Residential mortgage-backed securities |  |
Investments: |  |
Fair value | 0 | 0
Investments: | Level I | Commercial mortgage-backed securities |  |
Investments: |  |
Fair value | 0 | 0
Investments: | Level I | Equity securities |  |
Investments: |  |
Equity securities | 0 | 0
Investments: | Level II |  |
Investments: |  |
Total investments | 17,917 | 18,280
Investments: | Level II | U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Investments: |  |
Fair value | 0 | 0
Investments: | Level II | Corporate securities |  |
Investments: |  |
Fair value | 10,558 | 10,652
Investments: | Level II | Municipal securities |  |
Investments: |  |
Fair value | 2,860 | 2,906
Investments: | Level II | Short-term time deposits |  |
Investments: |  |
Fair value | 68 | 205
Investments: | Level II | Asset-backed securities |  |
Investments: |  |
Fair value | 1,612 | 1,666
Investments: | Level II | Residential mortgage-backed securities |  |
Investments: |  |
Fair value | 1,703 | 1,714
Investments: | Level II | Commercial mortgage-backed securities |  |
Investments: |  |
Fair value | 1,115 | 1,136
Investments: | Level II | Equity securities |  |
Investments: |  |
Equity securities | 1 | 1
Investments: | Level III |  |
Investments: |  |
Total investments | 0 | 0
Investments: | Level III | U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Investments: |  |
Fair value | 0 | 0
Investments: | Level III | Corporate securities |  |
Investments: |  |
Fair value | 0 | 0
Investments: | Level III | Municipal securities |  |
Investments: |  |
Fair value | 0 | 0
Investments: | Level III | Short-term time deposits |  |
Investments: |  |
Fair value | 0 | 0
Investments: | Level III | Asset-backed securities |  |
Investments: |  |
Fair value | 0 | 0
Investments: | Level III | Residential mortgage-backed securities |  |
Investments: |  |
Fair value | 0 | 0
Investments: | Level III | Commercial mortgage-backed securities |  |
Investments: |  |
Fair value | 0 | 0
Investments: | Level III | Equity securities |  |
Investments: |  |
Equity securities | 0 | 0
Restricted deposits: |  |
Investments: |  |
Fair value | 1,432 | 1,412
Restricted deposits: | U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Investments: |  |
Fair value | 479 | 480
Restricted deposits: | Corporate securities |  |
Investments: |  |
Fair value | 34 | 10
Restricted deposits: | Municipal securities |  |
Investments: |  |
Fair value | 829 | 852
Restricted deposits: | Cash and cash equivalents |  |
Investments: |  |
Fair value | 89 | 69
Restricted deposits: | Certificates of deposit |  |
Investments: |  |
Fair value | 1 | 1
Restricted deposits: | Level I |  |
Investments: |  |
Fair value | 568 | 549
Restricted deposits: | Level I | U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Investments: |  |
Fair value | 479 | 480
Restricted deposits: | Level I | Corporate securities |  |
Investments: |  |
Fair value | 0 | 0
Restricted deposits: | Level I | Municipal securities |  |
Investments: |  |
Fair value | 0 | 0
Restricted deposits: | Level I | Cash and cash equivalents |  |
Investments: |  |
Fair value | 89 | 69
Restricted deposits: | Level I | Certificates of deposit |  |
Investments: |  |
Fair value | 0 | 0
Restricted deposits: | Level II |  |
Investments: |  |
Fair value | 864 | 863
Restricted deposits: | Level II | U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Investments: |  |
Fair value | 0 | 0
Restricted deposits: | Level II | Corporate securities |  |
Investments: |  |
Fair value | 34 | 10
Restricted deposits: | Level II | Municipal securities |  |
Investments: |  |
Fair value | 829 | 852
Restricted deposits: | Level II | Cash and cash equivalents |  |
Investments: |  |
Fair value | 0 | 0
Restricted deposits: | Level II | Certificates of deposit |  |
Investments: |  |
Fair value | 1 | 1
Restricted deposits: | Level III |  |
Investments: |  |
Fair value | 0 | 0
Restricted deposits: | Level III | U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Investments: |  |
Fair value | 0 | 0
Restricted deposits: | Level III | Corporate securities |  |
Investments: |  |
Fair value | 0 | 0
Restricted deposits: | Level III | Municipal securities |  |
Investments: |  |
Fair value | 0 | 0
Restricted deposits: | Level III | Cash and cash equivalents |  |
Investments: |  |
Fair value | 0 | 0
Restricted deposits: | Level III | Certificates of deposit |  |
Investments: |  |
Fair value | $ 0 | $ 0

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: 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 5: 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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