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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 | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Debt securities: |  |
Gross Unrealized Gains | $ 148 | $ 256
Gross Unrealized Losses | (365) | (325)
Equity securities | 1 | 1
Private equity investments | 896 | 915
Life insurance contracts | 210 | 217
Total, Amortized Cost | 20,725 | 20,948
Total, Fair Value | 20,508 | 20,879
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Debt securities: |  |
Amortized Cost | 532 | 533
Gross Unrealized Gains | 1 | 3
Gross Unrealized Losses | (1) | (1)
Fair Value | 532 | 535
Corporate securities |  |
Debt securities: |  |
Amortized Cost | 10,676 | 10,642
Gross Unrealized Gains | 89 | 166
Gross Unrealized Losses | (173) | (146)
Fair Value | 10,592 | 10,662
Restricted certificates of deposit |  |
Debt securities: |  |
Amortized Cost | 1 | 1
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 1 | 1
Restricted cash equivalents |  |
Debt securities: |  |
Amortized Cost | 89 | 69
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 89 | 69
Short-term time deposits |  |
Debt securities: |  |
Amortized Cost | 68 | 205
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 68 | 205
Municipal securities |  |
Debt securities: |  |
Amortized Cost | 3,736 | 3,790
Gross Unrealized Gains | 25 | 37
Gross Unrealized Losses | (72) | (69)
Fair Value | 3,689 | 3,758
Asset-backed securities |  |
Debt securities: |  |
Amortized Cost | 1,612 | 1,656
Gross Unrealized Gains | 13 | 20
Gross Unrealized Losses | (13) | (10)
Fair Value | 1,612 | 1,666
Residential mortgage-backed securities |  |
Debt securities: |  |
Amortized Cost | 1,764 | 1,763
Gross Unrealized Gains | 14 | 21
Gross Unrealized Losses | (75) | (70)
Fair Value | 1,703 | 1,714
Commercial mortgage-backed securities |  |
Debt securities: |  |
Amortized Cost | 1,140 | 1,156
Gross Unrealized Gains | 6 | 9
Gross Unrealized Losses | (31) | (29)
Fair Value | $ 1,115 | $ 1,136

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