| Investments [Text Block] |
Investments A summary of debt securities by major security type is as follows: | | | | | | | | | | | | | | | | | | | | | | | | | | | | (in millions) | | Amortized
Cost | | Gross
Unrealized
Gains | | Gross
Unrealized
Losses | | Fair
Value | | March 31, 2026 | | | | | | | | | | Debt securities - available-for-sale: | | | | | | | | | | U.S. government and agency obligations | | $ | 3,605 | | | $ | — | | | $ | (168) | | | $ | 3,437 | | | State and municipal obligations | | 6,027 | | | 14 | | | (262) | | | 5,779 | | | Corporate obligations | | 28,157 | | | 80 | | | (699) | | | 27,538 | | | U.S. agency mortgage-backed securities | | 10,901 | | | 17 | | | (643) | | | 10,275 | | | Non-U.S. agency mortgage-backed securities | | 3,177 | | | 5 | | | (105) | | | 3,077 | | | Total debt securities - available-for-sale | | 51,867 | | | 116 | | | (1,877) | | | 50,106 | | | Debt securities - held-to-maturity: | | | | | | | | | | U.S. government and agency obligations | | 445 | | | 1 | | | (1) | | | 445 | | | State and municipal obligations | | 26 | | | — | | | (3) | | | 23 | | | Corporate obligations | | 3 | | | — | | | — | | | 3 | | | Total debt securities - held-to-maturity | | 474 | | | 1 | | | (4) | | | 471 | | | Total debt securities | | $ | 52,341 | | | $ | 117 | | | $ | (1,881) | | | $ | 50,577 | | | December 31, 2025 | | | | | | | | | | Debt securities - available-for-sale: | | | | | | | | | | U.S. government and agency obligations | | $ | 4,086 | | | $ | 2 | | | $ | (156) | | | $ | 3,932 | | | State and municipal obligations | | 6,533 | | | 24 | | | (232) | | | 6,325 | | | Corporate obligations | | 25,927 | | | 159 | | | (540) | | | 25,546 | | | U.S. agency mortgage-backed securities | | 10,284 | | | 33 | | | (598) | | | 9,719 | | | Non-U.S. agency mortgage-backed securities | | 2,748 | | | 11 | | | (99) | | | 2,660 | | | Total debt securities - available-for-sale | | 49,578 | | | 229 | | | (1,625) | | | 48,182 | | | Debt securities - held-to-maturity: | | | | | | | | | | U.S. government and agency obligations | | 461 | | | 2 | | | (1) | | | 462 | | | State and municipal obligations | | 26 | | | — | | | (2) | | | 24 | | | Corporate obligations | | 3 | | | — | | | — | | | 3 | | | Total debt securities - held-to-maturity | | 490 | | | 2 | | | (3) | | | 489 | | | Total debt securities | | $ | 50,068 | | | $ | 231 | | | $ | (1,628) | | | $ | 48,671 | |
The Company held $5.5 billion of equity securities as of March 31, 2026 and December 31, 2025. The Company’s investments in equity securities primarily consist of venture investments and employee savings plan related investments. The carrying values of equity securities held at fair value on a non-recurring basis were $3.5 billion and $3.3 billion, including cumulative net unrealized gains of $933 million and $846 million, as of March 31, 2026 and December 31, 2025, respectively. Additionally, the Company’s investments included $3.9 billion and $3.8 billion of equity method investments primarily in operating businesses in the health care sector as of March 31, 2026 and December 31, 2025, respectively. The allowance for credit losses on held-to-maturity securities at March 31, 2026 and December 31, 2025 was not material. The amortized cost and fair value of debt securities as of March 31, 2026, 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 | | $ | 3,334 | | | $ | 3,316 | | | $ | 267 | | | $ | 268 | | | Due after one year through five years | | 14,106 | | | 13,770 | | | 186 | | | 185 | | | Due after five years through ten years | | 12,664 | | | 12,254 | | | 4 | | | 4 | | | Due after ten years | | 7,685 | | | 7,414 | | | 17 | | | 14 | | | U.S. agency mortgage-backed securities | | 10,901 | | | 10,275 | | | — | | | — | | | Non-U.S. agency mortgage-backed securities | | 3,177 | | | 3,077 | | | — | | | — | | | Total debt securities | | $ | 51,867 | | | $ | 50,106 | | | $ | 474 | | | $ | 471 | |
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 | | March 31, 2026 | | | | | | | | | | | | | | U.S. government and agency obligations | | $ | 1,076 | | | $ | (10) | | | 1,959 | | | $ | (158) | | | $ | 3,035 | | | $ | (168) | | | State and municipal obligations | | 1,402 | | | (27) | | | 3,418 | | | (235) | | | 4,820 | | | (262) | | | Corporate obligations | | 11,495 | | | (130) | | | 9,010 | | | (569) | | | 20,505 | | | (699) | | | U.S. agency mortgage-backed securities | | 3,295 | | | (44) | | | 5,195 | | | (599) | | | 8,490 | | | (643) | | | Non-U.S. agency mortgage-backed securities | | 1,007 | | | (6) | | | 1,286 | | | (99) | | | 2,293 | | | (105) | | | Total debt securities - available-for-sale | | $ | 18,275 | | | $ | (217) | | | $ | 20,868 | | | $ | (1,660) | | | $ | 39,143 | | | $ | (1,877) | | | December 31, 2025 | | | | | | | | | | | | | | U.S. government and agency obligations | | $ | 500 | | | $ | (4) | | | $ | 2,339 | | | $ | (152) | | | $ | 2,839 | | | $ | (156) | | | State and municipal obligations | | 523 | | | (8) | | | 4,342 | | | (224) | | | 4,865 | | | (232) | | | Corporate obligations | | 2,661 | | | (16) | | | 10,399 | | | (524) | | | 13,060 | | | (540) | | | U.S. agency mortgage-backed securities | | 346 | | | (1) | | | 6,665 | | | (597) | | | 7,011 | | | (598) | | | Non-U.S. agency mortgage-backed securities | | 184 | | | (1) | | | 1,355 | | | (98) | | | 1,539 | | | (99) | | | Total debt securities - available-for-sale | | $ | 4,214 | | | $ | (30) | | | $ | 25,100 | | | $ | (1,595) | | | $ | 29,314 | | | $ | (1,625) | |
The Company’s unrealized losses from debt securities as of March 31, 2026 were generated from approximately 31,000 positions out of a total of 42,000 positions. The Company believes that it will timely collect the principal and interest due on its debt securities that have an amortized cost in excess of fair value. The unrealized losses were primarily caused by interest rate increases and not by unfavorable changes in the credit quality associated with these securities which impacted the Company’s assessment on collectability of principal and interest. At each reporting period, the Company evaluates available-for-sale debt securities for any credit-related impairment when the fair value of the investment is less than its amortized cost. The Company evaluated the expected cash flows, the underlying credit quality and credit ratings of the issuers, noting no significant credit deterioration since purchase. As of March 31, 2026, the Company did not have the intent to sell any of the available-for-sale debt securities in an unrealized loss position. Therefore, the Company believes these losses to be temporary. The allowance for credit losses on available-for-sale debt securities at March 31, 2026 and December 31, 2025 was not material.
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