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Short-term and Long-term Investments, Restricted Deposits (Tables) | 12 Months Ended
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Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract] |
Schedule of Short-term and Long-term Investments and Restricted Deposits by Investment Type | Short-term and long-term investments and restricted deposits by investment type consist of the following ($ in millions):
| December 31, 2025 |  | December 31, 2024
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies | $ | 533 |  |  | $ | 3 |  |  | $ | (1) |  |  | $ | 535 |  |  | $ | 593 |  |  | $ | 2 |  |  | $ | (4) |  |  | $ | 591 |
Corporate securities | 10,642 |  |  | 166 |  |  | (146) |  |  | 10,662 |  |  | 10,820 |  |  | 47 |  |  | (360) |  |  | 10,507 |
Restricted certificates of deposit | 1 |  |  | — |  |  | — |  |  | 1 |  |  | 4 |  |  | — |  |  | — |  |  | 4 |
Restricted cash equivalents | 69 |  |  | — |  |  | — |  |  | 69 |  |  | 93 |  |  | — |  |  | — |  |  | 93 |
Short-term time deposits | 205 |  |  | — |  |  | — |  |  | 205 |  |  | 425 |  |  | — |  |  | — |  |  | 425 |
Municipal securities | 3,790 |  |  | 37 |  |  | (69) |  |  | 3,758 |  |  | 4,174 |  |  | 7 |  |  | (151) |  |  | 4,030 |
Asset-backed securities | 1,656 |  |  | 20 |  |  | (10) |  |  | 1,666 |  |  | 1,820 |  |  | 13 |  |  | (21) |  |  | 1,812 |
Residential mortgage-backed securities | 1,763 |  |  | 21 |  |  | (70) |  |  | 1,714 |  |  | 1,807 |  |  | 1 |  |  | (129) |  |  | 1,679 |
Commercial mortgage-backed securities | 1,156 |  |  | 9 |  |  | (29) |  |  | 1,136 |  |  | 1,298 |  |  | 3 |  |  | (62) |  |  | 1,239 |
Equity securities | 1 |  |  | — |  |  | — |  |  | 1 |  |  | 14 |  |  | — |  |  | — |  |  | 14 |
Private equity investments | 915 |  |  | — |  |  | — |  |  | 915 |  |  | 851 |  |  | — |  |  | — |  |  | 851 |
Life insurance contracts | 217 |  |  | — |  |  | — |  |  | 217 |  |  | 196 |  |  | — |  |  | — |  |  | 196 |
Total | $ | 20,948 |  |  | $ | 256 |  |  | $ | (325) |  |  | $ | 20,879 |  |  | $ | 22,095 |  |  | $ | 73 |  |  | $ | (727) |  |  | $ | 21,441 |
Schedule of Fair Value of Available-for-sale Debt Securities with Gross Unrealized Losses by Investment Type in a Continuous Unrealized Loss Position | The fair value of available-for-sale debt securities with gross unrealized losses by investment type and length of time that individual securities have been in a continuous unrealized loss position were as follows ($ in millions):
| December 31, 2025 |  | December 31, 2024
| Less Than 12 Months |  | 12 Months or More |  | Less Than 12 Months |  | 12 Months or More
| Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value
U.S. Treasury securities and obligations of U.S. government corporations and agencies | $ | — |  |  | $ | 88 |  |  | $ | (1) |  |  | $ | 43 |  |  | $ | (1) |  |  | $ | 60 |  |  | $ | (3) |  |  | $ | 144 |
Corporate securities | (2) |  |  | 464 |  |  | (144) |  |  | 3,226 |  |  | (41) |  |  | 2,621 |  |  | (319) |  |  | 4,782 |
Municipal securities | (1) |  |  | 241 |  |  | (68) |  |  | 1,550 |  |  | (16) |  |  | 1,217 |  |  | (135) |  |  | 2,073 |
Asset-backed securities | (2) |  |  | 114 |  |  | (8) |  |  | 180 |  |  | (4) |  |  | 301 |  |  | (17) |  |  | 331 |
Residential mortgage-backed securities | — |  |  | 120 |  |  | (70) |  |  | 687 |  |  | (18) |  |  | 786 |  |  | (111) |  |  | 738 |
Commercial mortgage-backed securities | — |  |  | 156 |  |  | (29) |  |  | 480 |  |  | (4) |  |  | 210 |  |  | (58) |  |  | 666 |
Total | $ | (5) |  |  | $ | 1,183 |  |  | $ | (320) |  |  | $ | 6,166 |  |  | $ | (84) |  |  | $ | 5,195 |  |  | $ | (643) |  |  | $ | 8,734 |
Schedule of Contractual Maturities of Short-term and Long-term Investments and Restricted Deposits | The contractual maturities of short-term and long-term debt securities and restricted deposits are as follows ($ in millions):
| December 31, 2025 |  | December 31, 2024
| Investments |  | Restricted Deposits |  | Investments |  | Restricted Deposits
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
One year or less | $ | 2,201 |  |  | $ | 2,190 |  |  | $ | 464 |  |  | $ | 464 |  |  | $ | 2,383 |  |  | $ | 2,365 |  |  | $ | 477 |  |  | $ | 475 |
One year through five years | 7,266 |  |  | 7,219 |  |  | 574 |  |  | 566 |  |  | 7,799 |  |  | 7,563 |  |  | 610 |  |  | 593 |
Five years through ten years | 4,198 |  |  | 4,252 |  |  | 334 |  |  | 339 |  |  | 4,343 |  |  | 4,172 |  |  | 301 |  |  | 291 |
Greater than ten years | 160 |  |  | 157 |  |  | 43 |  |  | 43 |  |  | 165 |  |  | 160 |  |  | 31 |  |  | 31 |
Asset-backed securities | 4,575 |  |  | 4,516 |  |  | — |  |  | — |  |  | 4,925 |  |  | 4,730 |  |  | — |  |  | — |
Total | $ | 18,400 |  |  | $ | 18,334 |  |  | $ | 1,415 |  |  | $ | 1,412 |  |  | $ | 19,615 |  |  | $ | 18,990 |  |  | $ | 1,419 |  |  | $ | 1,390 |

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