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v3.20.4

Investments (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2020 |  |  |  |  |  |  |  |
Debt securities - available-for-sale: |  |  |  |  |  |  |  |
U.S. government and agency obligations |  | $ | 3,335 |  |  | $ | 133 |  |  | $ | (3) |  |  | $ | 3,465 |
State and municipal obligations |  | 6,893 |  |  | 435 |  |  | — |  |  | 7,328 |
Corporate obligations |  | 18,886 |  |  | 863 |  |  | (12) |  |  | 19,737 |
U.S. agency mortgage-backed securities |  | 6,849 |  |  | 245 |  |  | (3) |  |  | 7,091 |
Non-U.S. agency mortgage-backed securities |  | 2,116 |  |  | 95 |  |  | (4) |  |  | 2,207 |
Total debt securities - available-for-sale |  | 38,079 |  |  | 1,771 |  |  | (22) |  |  | 39,828 |
Debt securities - held-to-maturity: |  |  |  |  |  |  |  |
U.S. government and agency obligations |  | 420 |  |  | 6 |  |  | — |  |  | 426 |
State and municipal obligations |  | 31 |  |  | 2 |  |  | — |  |  | 33 |
Corporate obligations |  | 187 |  |  | 1 |  |  | — |  |  | 188 |
Total debt securities - held-to-maturity |  | 638 |  |  | 9 |  |  | — |  |  | 647 |
Total debt securities |  | $ | 38,717 |  |  | $ | 1,780 |  |  | $ | (22) |  |  | $ | 40,475 |
December 31, 2019 |  |  |  |  |  |  |  |
Debt securities - available-for-sale: |  |  |  |  |  |  |  |
U.S. government and agency obligations |  | $ | 3,502 |  |  | $ | 55 |  |  | $ | (4) |  |  | $ | 3,553 |
State and municipal obligations |  | 5,680 |  |  | 251 |  |  | (5) |  |  | 5,926 |
Corporate obligations |  | 17,910 |  |  | 343 |  |  | (11) |  |  | 18,242 |
U.S. agency mortgage-backed securities |  | 6,425 |  |  | 109 |  |  | (6) |  |  | 6,528 |
Non-U.S. agency mortgage-backed securities |  | 1,811 |  |  | 37 |  |  | (3) |  |  | 1,845 |
Total debt securities - available-for-sale |  | 35,328 |  |  | 795 |  |  | (29) |  |  | 36,094 |
Debt securities - held-to-maturity: |  |  |  |  |  |  |  |
U.S. government and agency obligations |  | 402 |  |  | 2 |  |  | — |  |  | 404 |
State and municipal obligations |  | 32 |  |  | 2 |  |  | — |  |  | 34 |
Corporate obligations |  | 538 |  |  | — |  |  | (1) |  |  | 537 |
Total debt securities - held-to-maturity |  | 972 |  |  | 4 |  |  | (1) |  |  | 975 |
Total debt securities |  | $ | 36,300 |  |  | $ | 799 |  |  | $ | (30) |  |  | $ | 37,069 |
Investments by Contractual Maturity [Table Text Block] | The amortized cost and fair value of debt securities as of December 31, 2020, 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 |  | $ | 2,951 |  |  | $ | 2,966 |  |  | $ | 348 |  |  | $ | 349 |
Due after one year through five years |  | 11,638 |  |  | 12,088 |  |  | 241 |  |  | 245 |
Due after five years through ten years |  | 10,212 |  |  | 10,931 |  |  | 27 |  |  | 29 |
Due after ten years |  | 4,313 |  |  | 4,545 |  |  | 22 |  |  | 24 |
U.S. agency mortgage-backed securities |  | 6,849 |  |  | 7,091 |  |  | — |  |  | — |
Non-U.S. agency mortgage-backed securities |  | 2,116 |  |  | 2,207 |  |  | — |  |  | — |
Total debt securities |  | $ | 38,079 |  |  | $ | 39,828 |  |  | $ | 638 |  |  | $ | 647 |
Fair Value of Available-for-Sale Investments with Gross Unrealized Losses by Investment Type and Length of Time that Individual Securities have been in a Continuous Unrealized Loss Position [Table Text Block] | 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, 2020 |  |  |  |  |  |  |  |  |  |  |  |
U.S. government and agency obligations |  | $ | 346 |  |  | $ | (3) |  |  | $ | — |  |  | $ | — |  |  | $ | 346 |  |  | $ | (3) |
Corporate obligations |  | 1,273 |  |  | (9) |  |  | 456 |  |  | (3) |  |  | 1,729 |  |  | (12) |
U.S. agency mortgage-backed securities |  | 601 |  |  | (3) |  |  | — |  |  | — |  |  | 601 |  |  | (3) |
Non-U.S. agency mortgage-backed securities |  | 195 |  |  | (1) |  |  | 93 |  |  | (3) |  |  | 288 |  |  | (4) |
Total debt securities - available-for-sale |  | $ | 2,415 |  |  | $ | (16) |  |  | $ | 549 |  |  | $ | (6) |  |  | $ | 2,964 |  |  | $ | (22) |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |
U.S. government and agency obligations |  | $ | 616 |  |  | $ | (4) |  |  | $ | — |  |  | $ | — |  |  | $ | 616 |  |  | $ | (4) |
State and municipal obligations |  | 440 |  |  | (5) |  |  | — |  |  | — |  |  | 440 |  |  | (5) |
Corporate obligations |  | 1,903 |  |  | (7) |  |  | 740 |  |  | (4) |  |  | 2,643 |  |  | (11) |
U.S. agency mortgage-backed securities |  | 657 |  |  | (3) |  |  | 333 |  |  | (3) |  |  | 990 |  |  | (6) |
Non-U.S. agency mortgage-backed securities |  | 406 |  |  | (3) |  |  | — |  |  | — |  |  | 406 |  |  | (3) |
Total debt securities - available-for-sale |  | $ | 4,022 |  |  | $ | (22) |  |  | $ | 1,073 |  |  | $ | (7) |  |  | $ | 5,095 |  |  | $ | (29) |

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