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INVESTMENT SECURITIES | 12 Months Ended
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Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract] |
INVESTMENT SECURITIES | INVESTMENT SECURITIES Investment securities classified as current and long-term were as follows at December 31, 2022 and 2021, respectively:
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
| (in millions)
December 31, 2022 |  |  |  |  |  |  |
U.S. Treasury and other U.S. government corporations and agencies: |  |  |  |  |  |  |
U.S. Treasury and agency obligations | $ | 1,093 |  |  | $ | 1 |  |  | $ | (55) |  |  | $ | 1,039 |
Mortgage-backed securities | 3,697 |  |  | 4 |  |  | (471) |  |  | 3,230 |
Tax-exempt municipal securities | 765 |  |  | — |  |  | (37) |  |  | 728 |
Mortgage-backed securities: |  |  |  |  |  |  |
Residential | 477 |  |  | — |  |  | (76) |  |  | 401 |
Commercial | 1,554 |  |  | — |  |  | (155) |  |  | 1,399 |
Asset-backed securities | 1,809 |  |  | 1 |  |  | (79) |  |  | 1,731 |
Corporate debt securities | 6,551 |  |  | 3 |  |  | (828) |  |  | 5,726 |
Total debt securities | $ | 15,946 |  |  | $ | 9 |  |  | $ | (1,701) |  |  | 14,254 |
Common stock |  |  |  |  |  |  | 7 |
Total investment securities |  |  |  |  |  |  | $ | 14,261 |
December 31, 2021 |  |  |  |  |  |  |
U.S. Treasury and other U.S. government corporations and agencies: |  |  |  |  |  |  |
U.S. Treasury and agency obligations | $ | 611 |  |  | $ | 1 |  |  | $ | (10) |  |  | $ | 602 |
Mortgage-backed securities | 3,265 |  |  | 33 |  |  | (69) |  |  | 3,229 |
Tax-exempt municipal securities | 810 |  |  | 33 |  |  | (2) |  |  | 841 |
Mortgage-backed securities: |  |  |  |  |  |  |
Residential | 373 |  |  | — |  |  | (6) |  |  | 367 |
Commercial | 1,394 |  |  | 27 |  |  | (11) |  |  | 1,410 |
Asset-backed securities | 1,346 |  |  | 6 |  |  | (4) |  |  | 1,348 |
Corporate debt securities | 5,641 |  |  | 118 |  |  | (59) |  |  | 5,700 |
Total debt securities | $ | 13,440 |  |  | $ | 218 |  |  | $ | (161) |  |  | 13,497 |
Common stock |  |  |  |  |  |  | 475 |
Total investment securities |  |  |  |  |  |  | $ | 13,972 |
In August 2022, we purchased certain corporate debt securities of KAH Hospice subsequent to the sale. The book value and fair value are $280 million and $278 million, respectively, at December 31, 2022. Gross unrealized losses and fair values aggregated by investment category and length of time that individual debt securities have been in a continuous unrealized loss position were as follows at December 31, 2022 and 2021, respectively:
| Less than 12 months |  | 12 months or more |  | Total
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
| (in millions)
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and other U.S. government corporations and agencies: |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and agency obligations | $ | 512 |  |  | $ | (5) |  |  | $ | 397 |  |  | $ | (50) |  |  | $ | 909 |  |  | $ | (55) |
Mortgage-backed securities | 1,231 |  |  | (104) |  |  | 1,683 |  |  | (367) |  |  | 2,914 |  |  | (471) |
Tax-exempt municipal securities | 64 |  |  | (2) |  |  | 615 |  |  | (36) |  |  | 679 |  |  | (38) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Residential | 124 |  |  | (16) |  |  | 274 |  |  | (60) |  |  | 398 |  |  | (76) |
Commercial | 243 |  |  | (13) |  |  | 1,157 |  |  | (142) |  |  | 1,400 |  |  | (155) |
Asset-backed securities | 620 |  |  | (32) |  |  | 1,011 |  |  | (46) |  |  | 1,631 |  |  | (78) |
Corporate debt securities | 1,625 |  |  | (98) |  |  | 3,825 |  |  | (730) |  |  | 5,450 |  |  | (828) |
Total debt securities | $ | 4,419 |  |  | $ | (270) |  |  | $ | 8,962 |  |  | $ | (1,431) |  |  | $ | 13,381 |  |  | $ | (1,701) |
December 31, 2021 |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and other U.S. government corporations and agencies: |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and agency obligations | $ | 201 |  |  | $ | (3) |  |  | $ | 355 |  |  | $ | (7) |  |  | $ | 556 |  |  | $ | (10) |
Mortgage-backed securities | 2,082 |  |  | (49) |  |  | 556 |  |  | (20) |  |  | 2,638 |  |  | (69) |
Tax-exempt municipal securities | 68 |  |  | (1) |  |  | 34 |  |  | (1) |  |  | 102 |  |  | (2) |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Residential | 358 |  |  | (6) |  |  | 8 |  |  | — |  |  | 366 |  |  | (6) |
Commercial | 295 |  |  | (4) |  |  | 400 |  |  | (7) |  |  | 695 |  |  | (11) |
Asset-backed securities | 530 |  |  | (3) |  |  | 425 |  |  | (1) |  |  | 955 |  |  | (4) |
Corporate debt securities | 1,456 |  |  | (28) |  |  | 769 |  |  | (31) |  |  | 2,225 |  |  | (59) |
Total debt securities | $ | 4,990 |  |  | $ | (94) |  |  | $ | 2,547 |  |  | $ | (67) |  |  | $ | 7,537 |  |  | $ | (161) |
Approximately 96% of our debt securities were investment-grade quality, with a weighted average credit rating of AA- by S&P at December 31, 2022. Most of the debt securities that were below investment-grade were rated BB-, the higher end of the below investment-grade rating scale. Tax-exempt municipal securities were diversified among general obligation bonds of states and local municipalities in the United States as well as special revenue bonds issued by municipalities to finance specific public works projects such as utilities, water and sewer, transportation, or education. Our general obligation bonds are diversified across the United States with no individual state exceeding 1% of our total debt securities. Our investment policy limits investments in a single issuer and requires diversification among various asset types. Our unrealized loss from all debt securities was generated from approximately 1,625 positions out of a total of approximately 1,710 positions at December 31, 2022. All issuers of debt securities we own that were trading at an unrealized loss at December 31, 2022 remain current on all contractual payments. After taking into account these and other factors previously described, we believe these unrealized losses primarily were caused by an increase in market interest rates in the current markets since the time the debt securities were purchased. At December 31, 2022, we did not intend to sell any debt securities with an unrealized loss position in accumulated other comprehensive income, and it is not likely that we will be required to sell these debt securities before recovery of their amortized cost basis. Additionally, we did not record any material credit allowances for debt securities that were in an unrealized loss position at December 31, 2022, 2021 or 2020. The detail of realized gains (losses) related to investment securities and included within investment income was as follows for the years ended December 31, 2022, 2021, and 2020:
| 2022 |  | 2021 |  | 2020
| (in millions)
Gross gains on investment securities | $ | 62 |  |  | $ | 219 |  |  | $ | 110 |
Gross losses on investment securities | (144) |  |  | (8) |  |  | (18) |
Gross gains on equity securities | 51 |  |  | 23 |  |  | 746 |
Gross losses on equity securities | (174) |  |  | (364) |  |  | — |
Net recognized (losses) gains on investment securities | $ | (205) |  |  | $ | (130) |  |  | $ | 838 |
The gains and losses related to equity securities for the years ended December 31, 2022, 2021 and 2020 was as follows:
| 2022 |  | 2021 |  | 2020 |  |  |
| (in millions) |  |  |
Net (losses) gains recognized on equity securities during the period | $ | (123) |  |  | $ | (341) |  |  | $ | 746 |  |  |  |
Less: Net losses recognized on equity securities sold during the period | (105) |  |  | (13) |  |  | — |  |  |  |
Unrealized (losses) gains recognized on equity securities still held at the end of the period | $ | (18) |  |  | $ | (328) |  |  | $ | 746 |  |  |  |
All purchases of and proceeds from investment securities for the year ended December 31, 2020 relate to debt securities. The contractual maturities of debt securities available for sale at December 31, 2022, regardless of their balance sheet classification, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
| Amortized Cost |  | Fair Value
| (in millions)
Due within one year | $ | 529 |  |  | $ | 525 |
Due after one year through five years | 3,399 |  |  | 3,210 |
Due after five years through ten years | 3,231 |  |  | 2,764 |
Due after ten years | 1,250 |  |  | 994 |
Mortgage and asset-backed securities | 7,537 |  |  | 6,761 |
Total debt securities | $ | 15,946 |  |  | $ | 14,254 |

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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