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Short-term and Long-term Investments, Restricted Deposits - Schedule of Short-term and Long-term Investments and Restricted Deposits by Investment Type (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities |  |
Gross Unrealized Gains | $ 256 | $ 73
Gross Unrealized Losses | (325) | (727)
Equity securities | 1 | 14
Private equity investments | 915 | 851
Life insurance contracts | 217 | 196
Total, Amortized Cost | 20,948 | 22,095
Total, Fair Value | 20,879 | 21,441
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Debt Securities |  |
Amortized Cost | 533 | 593
Gross Unrealized Gains | 3 | 2
Gross Unrealized Losses | (1) | (4)
Fair Value | 535 | 591
Corporate securities |  |
Debt Securities |  |
Amortized Cost | 10,642 | 10,820
Gross Unrealized Gains | 166 | 47
Gross Unrealized Losses | (146) | (360)
Fair Value | 10,662 | 10,507
Restricted certificates of deposit |  |
Debt Securities |  |
Amortized Cost | 1 | 4
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 1 | 4
Restricted cash equivalents |  |
Debt Securities |  |
Amortized Cost | 69 | 93
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 69 | 93
Short-term time deposits |  |
Debt Securities |  |
Amortized Cost | 205 | 425
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 205 | 425
Municipal securities |  |
Debt Securities |  |
Amortized Cost | 3,790 | 4,174
Gross Unrealized Gains | 37 | 7
Gross Unrealized Losses | (69) | (151)
Fair Value | 3,758 | 4,030
Asset-backed securities |  |
Debt Securities |  |
Amortized Cost | 1,656 | 1,820
Gross Unrealized Gains | 20 | 13
Gross Unrealized Losses | (10) | (21)
Fair Value | 1,666 | 1,812
Residential mortgage-backed securities |  |
Debt Securities |  |
Amortized Cost | 1,763 | 1,807
Gross Unrealized Gains | 21 | 1
Gross Unrealized Losses | (70) | (129)
Fair Value | 1,714 | 1,679
Commercial mortgage-backed securities |  |
Debt Securities |  |
Amortized Cost | 1,156 | 1,298
Gross Unrealized Gains | 9 | 3
Gross Unrealized Losses | (29) | (62)
Fair Value | $ 1,136 | $ 1,239

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