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Investments (Tables) | 12 Months Ended
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Dec. 31, 2024
Short-Term and Long-Term Investments [Table Text Block] | A summary of debt securities by major security type is as follows:
(in millions) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
December 31, 2024 |  |  |  |  |  |  |  |
Debt securities - available-for-sale: |  |  |  |  |  |  |  |
U.S. government and agency obligations |  | $ | 4,600 |  |  | $ | 1 |  |  | $ | (274) |  |  | $ | 4,327 |
State and municipal obligations |  | 7,357 |  |  | 2 |  |  | (375) |  |  | 6,984 |
Corporate obligations |  | 24,391 |  |  | 56 |  |  | (1,140) |  |  | 23,307 |
U.S. agency mortgage-backed securities |  | 10,577 |  |  | 1 |  |  | (994) |  |  | 9,584 |
Non-U.S. agency mortgage-backed securities |  | 2,890 |  |  | 2 |  |  | (175) |  |  | 2,717 |
Total debt securities - available-for-sale |  | 49,815 |  |  | 62 |  |  | (2,958) |  |  | 46,919 |
Debt securities - held-to-maturity: |  |  |  |  |  |  |  |
U.S. government and agency obligations |  | 444 |  |  | — |  |  | (2) |  |  | 442 |
State and municipal obligations |  | 28 |  |  | — |  |  | (2) |  |  | 26 |
Corporate obligations |  | 40 |  |  | — |  |  | — |  |  | 40 |
Total debt securities - held-to-maturity |  | 512 |  |  | — |  |  | (4) |  |  | 508 |
Total debt securities |  | $ | 50,327 |  |  | $ | 62 |  |  | $ | (2,962) |  |  | $ | 47,427 |
December 31, 2023 |  |  |  |  |  |  |  |
Debt securities - available-for-sale: |  |  |  |  |  |  |  |
U.S. government and agency obligations |  | $ | 4,674 |  |  | $ | 3 |  |  | $ | (234) |  |  | $ | 4,443 |
State and municipal obligations |  | 7,636 |  |  | 39 |  |  | (322) |  |  | 7,353 |
Corporate obligations |  | 23,136 |  |  | 67 |  |  | (1,186) |  |  | 22,017 |
U.S. agency mortgage-backed securities |  | 8,982 |  |  | 22 |  |  | (708) |  |  | 8,296 |
Non-U.S. agency mortgage-backed securities |  | 3,023 |  |  | 3 |  |  | (240) |  |  | 2,786 |
Total debt securities - available-for-sale |  | 47,451 |  |  | 134 |  |  | (2,690) |  |  | 44,895 |
Debt securities - held-to-maturity: |  |  |  |  |  |  |  |
U.S. government and agency obligations |  | 506 |  |  | 1 |  |  | (6) |  |  | 501 |
State and municipal obligations |  | 28 |  |  | — |  |  | (2) |  |  | 26 |
Corporate obligations |  | 69 |  |  | — |  |  | — |  |  | 69 |
Total debt securities - held-to-maturity |  | 603 |  |  | 1 |  |  | (8) |  |  | 596 |
Total debt securities |  | $ | 48,054 |  |  | $ | 135 |  |  | $ | (2,698) |  |  | $ | 45,491 |
Investments by Contractual Maturity [Table Text Block] | The amortized cost and fair value of debt securities as of December 31, 2024, by contractual maturity, were as follows:
|  | Available-for-Sale |  | Held-to-Maturity
(in millions) |  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Due in one year or less |  | $ | 3,952 |  |  | $ | 3,932 |  |  | $ | 320 |  |  | $ | 319 |
Due after one year through five years |  | 14,845 |  |  | 14,384 |  |  | 161 |  |  | 161 |
Due after five years through ten years |  | 12,110 |  |  | 11,213 |  |  | 14 |  |  | 13 |
Due after ten years |  | 5,441 |  |  | 5,089 |  |  | 17 |  |  | 15 |
U.S. agency mortgage-backed securities |  | 10,577 |  |  | 9,584 |  |  | — |  |  | — |
Non-U.S. agency mortgage-backed securities |  | 2,890 |  |  | 2,717 |  |  | — |  |  | — |
Total debt securities |  | $ | 49,815 |  |  | $ | 46,919 |  |  | $ | 512 |  |  | $ | 508 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value | The fair value of available-for-sale debt securities with gross unrealized losses by major security type and length of time that individual securities have been in a continuous unrealized loss position were as follows:
|  | Less Than 12 Months |  | 12 Months or Greater |  | Total
(in millions) |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |
U.S. government and agency obligations |  | $ | 1,475 |  |  | $ | (51) |  |  | $ | 2,152 |  |  | $ | (223) |  |  | $ | 3,627 |  |  | $ | (274) |
State and municipal obligations |  | 2,593 |  |  | (58) |  |  | 4,085 |  |  | (317) |  |  | 6,678 |  |  | (375) |
Corporate obligations |  | 7,402 |  |  | (213) |  |  | 11,449 |  |  | (927) |  |  | 18,851 |  |  | (1,140) |
U.S. agency mortgage-backed securities |  | 4,791 |  |  | (191) |  |  | 4,674 |  |  | (803) |  |  | 9,465 |  |  | (994) |
Non-U.S. agency mortgage-backed securities |  | 416 |  |  | (5) |  |  | 1,863 |  |  | (170) |  |  | 2,279 |  |  | (175) |
Total debt securities - available-for-sale |  | $ | 16,677 |  |  | $ | (518) |  |  | $ | 24,223 |  |  | $ | (2,440) |  |  | $ | 40,900 |  |  | $ | (2,958) |
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
U.S. government and agency obligations |  | $ | 1,270 |  |  | $ | (7) |  |  | $ | 2,077 |  |  | $ | (227) |  |  | $ | 3,347 |  |  | $ | (234) |
State and municipal obligations |  | 907 |  |  | (7) |  |  | 4,063 |  |  | (315) |  |  | 4,970 |  |  | (322) |
Corporate obligations |  | 1,826 |  |  | (17) |  |  | 14,696 |  |  | (1,169) |  |  | 16,522 |  |  | (1,186) |
U.S. agency mortgage-backed securities |  | 1,337 |  |  | (12) |  |  | 5,069 |  |  | (696) |  |  | 6,406 |  |  | (708) |
Non-U.S. agency mortgage-backed securities |  | 279 |  |  | (6) |  |  | 2,202 |  |  | (234) |  |  | 2,481 |  |  | (240) |
Total debt securities - available-for-sale |  | $ | 5,619 |  |  | $ | (49) |  |  | $ | 28,107 |  |  | $ | (2,641) |  |  | $ | 33,726 |  |  | $ | (2,690) |

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