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Fair Value Measurements - Schedule of Fair Value Measurements by Level for Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Assets
Cash and cash equivalents	$ 17,888	$ 14,063
Investments:
Equity securities	1	14
Total assets at fair value	37,635	34,457
U.S. Treasury securities and obligations of U.S. government corporations and agencies
Investments:
Fair value	535	591
Corporate securities
Investments:
Fair value	10,662	10,507
Municipal securities
Investments:
Fair value	3,758	4,030
Short-term time deposits
Investments:
Fair value	205	425
Asset-backed securities
Investments:
Fair value	1,666	1,812
Residential mortgage-backed securities
Investments:
Fair value	1,714	1,679
Commercial mortgage-backed securities
Investments:
Fair value	1,136	1,239
Level I
Assets
Cash and cash equivalents	17,888	14,063
Investments:
Total assets at fair value	18,492	14,760
Level II
Assets
Cash and cash equivalents	0	0
Investments:
Total assets at fair value	19,143	19,697
Level III
Assets
Cash and cash equivalents	0	0
Investments:
Total assets at fair value	0	0
Investments
Investments:
Fair value	18,334	18,990
Total investments	18,335	19,004
Investments | U.S. Treasury securities and obligations of U.S. government corporations and agencies
Investments:
Fair value	55	58
Investments | Corporate securities
Investments:
Fair value	10,652	10,505
Investments | Municipal securities
Investments:
Fair value	2,906	3,272
Investments | Short-term time deposits
Investments:
Fair value	205	425
Investments | Asset-backed securities
Investments:
Fair value	1,666	1,812
Investments | Residential mortgage-backed securities
Investments:
Fair value	1,714	1,679
Investments | Commercial mortgage-backed securities
Investments:
Fair value	1,136	1,239
Investments | Equity Securities
Investments:
Equity securities	1	14
Investments | Level I
Investments:
Total investments	55	71
Investments | Level I | U.S. Treasury securities and obligations of U.S. government corporations and agencies
Investments:
Fair value	55	58
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	13
Investments | Level II
Investments:
Total investments	18,280	18,933
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	10,652	10,505
Investments | Level II | Municipal securities
Investments:
Fair value	2,906	3,272
Investments | Level II | Short-term time deposits
Investments:
Fair value	205	425
Investments | Level II | Asset-backed securities
Investments:
Fair value	1,666	1,812
Investments | Level II | Residential mortgage-backed securities
Investments:
Fair value	1,714	1,679
Investments | Level II | Commercial mortgage-backed securities
Investments:
Fair value	1,136	1,239
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	1,412	1,390
Restricted Deposits | U.S. Treasury securities and obligations of U.S. government corporations and agencies
Investments:
Fair value	480	533
Restricted Deposits | Corporate securities
Investments:
Fair value	10	2
Restricted Deposits | Municipal securities
Investments:
Fair value	852	758
Restricted Deposits | Cash and cash equivalents
Investments:
Fair value	69	93
Restricted Deposits | Certificates of deposit
Investments:
Fair value	1	4
Restricted Deposits | Level I
Investments:
Fair value	549	626
Restricted Deposits | Level I | U.S. Treasury securities and obligations of U.S. government corporations and agencies
Investments:
Fair value	480	533
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	69	93
Restricted Deposits | Level I | Certificates of deposit
Investments:
Fair value	0	0
Restricted Deposits | Level II
Investments:
Fair value	863	764
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	10	2
Restricted Deposits | Level II | Municipal securities
Investments:
Fair value	852	758
Restricted Deposits | Level II | Cash and cash equivalents
Investments:
Fair value	0	0
Restricted Deposits | Level II | Certificates of deposit
Investments:
Fair value	1	4
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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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.

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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