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Investments (Tables)
 6 Months Ended
Jun. 30, 2021
Investments [Abstract]  
Schedule of Total Investments
Total investments at June 30, 2021 and December 31, 2020 were as follows:
 June 30, 2021December 31, 2020
In millionsCurrentLong-termTotalCurrentLong-termTotal
Debt securities available for sale$2,878 $19,468 $22,346 $2,774 $18,414 $21,188 
Mortgage loans128 848 976 226 821 1,047 
Other investments— 1,820 1,820 — 1,577 1,577 
Total investments$3,006 $22,136 $25,142 $3,000 $20,812 $23,812 
Schedule of Debt Securities Available For Sale
Debt securities available for sale at June 30, 2021 and December 31, 2020 were as follows:
In millions
Amortized
 Cost (1)
Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
June 30, 2021
Debt securities:  
U.S. government securities$2,320 $91 $(1)$2,410 
States, municipalities and political subdivisions2,978 168 (2)3,144 
U.S. corporate securities8,754 822 (14)9,562 
Foreign securities2,652 247 (6)2,893 
Residential mortgage-backed securities812 20 (3)829 
Commercial mortgage-backed securities1,023 63 (5)1,081 
Other asset-backed securities2,372 26 (1)2,397 
Redeemable preferred securities27 3 — 30 
Total debt securities (2)
$20,938 $1,440 $(32)$22,346 
December 31, 2020
Debt securities:
U.S. government securities$2,341 $128 $— $2,469 
States, municipalities and political subdivisions2,556 172 — 2,728 
U.S. corporate securities7,879 1,023 (8)8,894 
Foreign securities2,595 324 (1)2,918 
Residential mortgage-backed securities673 32 — 705 
Commercial mortgage-backed securities962 84 — 1,046 
Other asset-backed securities2,369 36 (2)2,403 
Redeemable preferred securities21 4 — 25 
Total debt securities (2)
$19,396 $1,803 $(11)$21,188 
_____________________________________________
(1)There was no allowance for expected credit losses recorded on available-for-sale debt securities at June 30, 2021 or December 31, 2020.
(2)Investment risks associated with the Company’s experience-rated products generally do not impact the Company’s consolidated operating results. At June 30, 2021, debt securities with a fair value of $886 million, gross unrealized capital gains of $110 million and gross unrealized capital losses of $1 million and at December 31, 2020, debt securities with a fair value of $919 million, gross unrealized capital gains of $135 million and no gross unrealized capital losses were included in total debt securities, but support experience-rated products. Changes in net unrealized capital gains (losses) on these securities are not reflected in accumulated other comprehensive income.
Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity
The amortized cost and fair value of debt securities at June 30, 2021 are shown below by contractual maturity. Actual maturities may differ from contractual maturities because securities may be restructured, called or prepaid, or the Company intends to sell a security prior to maturity.
In millionsAmortized
Cost		Fair
Value
Due to mature: 
Less than one year$1,168 $1,183 
One year through five years7,095 7,397 
After five years through ten years4,418 4,682 
Greater than ten years4,050 4,777 
Residential mortgage-backed securities812 829 
Commercial mortgage-backed securities1,023 1,081 
Other asset-backed securities2,372 2,397 
Total$20,938 $22,346 
Schedule of Debt Securities In An Unrealized Capital Loss Position
Summarized below are the debt securities the Company held at June 30, 2021 and December 31, 2020 that were in an unrealized capital loss position, aggregated by the length of time the investments have been in that position:
Less than 12 monthsGreater than 12 monthsTotal
In millions, except number of securitiesNumber
of
Securities		Fair
Value		Unrealized
Losses		Number
of
Securities		Fair
Value		Unrealized
Losses		Number
of
Securities		Fair
Value		Unrealized
Losses
June 30, 2021  
Debt securities:  
U.S. government securities15 $76 $1 — $— $— 15 $76 $1 
States, municipalities and political subdivisions146 302 2 1 4 — 147 306 2 
U.S. corporate securities807 1,125 13 8 9 1 815 1,134 14 
Foreign securities237 374 6 2 2 — 239 376 6 
Residential mortgage-backed securities100 398 3 5 — — 105 398 3 
Commercial mortgage-backed securities85 241 5 — — — 85 241 5 
Other asset-backed securities272 505 1 24 28 — 296 533 1 
Redeemable preferred securities1 3 — — — — 1 3 — 
Total debt securities 1,663 $3,024 $31 40 $43 $1 1,703 $3,067 $32 
December 31, 2020  
Debt securities:  
U.S. government securities32 $205 $— — $— $— 32 $205 $— 
States, municipalities and political subdivisions49 83 — — — — 49 83 — 
U.S. corporate securities145 155 8 2 — — 147 155 8 
Foreign securities41 69 1 5 5 — 46 74 1 
Residential mortgage-backed securities23 26 — 3 — — 26 26 — 
Commercial mortgage-backed securities22 75 — — — — 22 75 — 
Other asset-backed securities156 256 1 49 41 1 205 297 2 
Total debt securities 468 $869 $10 59 $46 $1 527 $915 $11 
The maturity dates for debt securities in an unrealized capital loss position at June 30, 2021 were as follows:
 Supporting
experience-rated products		Supporting
remaining products		Total
In millionsFair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
Due to mature:      
Less than one year$— $— $23 $— $23 $— 
One year through five years1 — 1,005 7 1,006 7 
After five years through ten years15 — 613 11 628 11 
Greater than ten years2 1 236 4 238 5 
Residential mortgage-backed securities— — 398 3 398 3 
Commercial mortgage-backed securities6 — 235 5 241 5 
Other asset-backed securities1 — 532 1 533 1 
Total$25 $1 $3,042 $31 $3,067 $32 
Schedule of Activity in Mortgage Loan Portfolio During the three and six months ended June 30, 2021 and 2020, the Company had the following activity in its mortgage loan portfolio:
Three Months Ended
June 30,		Six Months Ended
June 30,
In millions2021202020212020
New mortgage loans$73 $16 $120 $24 
Mortgage loans fully repaid82 33 172 77 
Mortgage loans foreclosed— — — — 
Schedule of Mortgage Loan Amortized Cost and Credit Quality Indicator
Based on the Company’s assessments at June 30, 2021 and December 31, 2020, the amortized cost basis of the Company's mortgage loans within each credit quality indicator by year of origination was as follows:
Amortized Cost Basis by Year of Origination
In millions, except credit quality indicator20212020201920182017PriorTotal
June 30, 2021
1$— $— $— $— $23 $30 $53 
2 to 4118 57 88 73 71 490 897 
5 and 6— — — 3 4 11 18 
7— — — — — 8 8 
Total$118 $57 $88 $76 $98 $539 $976 
December 31, 2020
1$— $— $— $22 $37 $59 
2 to 446 96 91 124 595 952 
5 and 6— — 3 4 29 36 
7— — — — — — 
Total$46 $96 $94 $150 $661 $1,047 
Schedule of Net Investment Income
Sources of net investment income for the three and six months ended June 30, 2021 and 2020 were as follows:
Three Months Ended
June 30,		Six Months Ended
June 30,
In millions2021202020212020
Debt securities$160 $146 $317 $290 
Mortgage loans13 15 28 30 
Other investments112 (20)198 27 
Gross investment income285 141 543 347 
Investment expenses(9)(9)(17)(17)
Net investment income (excluding net realized capital gains or losses)276 132 526 330 
Net realized capital gains (1)
13 52 60 16 
Net investment income (2)
$289 $184 $586 $346 
_____________________________________________
(1)Net realized capital gains are net of yield-related impairment losses on debt securities of $2 million and $32 million, respectively, in the three and six months ended June 30, 2021. There were no credit-related losses on debt securities in the three and six months ended June 30, 2021. Net realized capital gains include the reversal of previously recorded credit-related impairment losses on debt securities of $42 million and yield-related impairment losses on debt securities of $1 million in the three months ended June 30, 2020. Net realized capital gains are net of credit-related and yield-related impairment losses on debt securities of $3 million and $42 million, respectively, in the six months ended June 30, 2020.
(2)Net investment income includes $10 million and $19 million for the three and six months ended June 30, 2021, respectively, and $10 million and $21 million for the three and six months ended June 30, 2020, respectively, related to investments supporting experience-rated products.
Schedule of Proceeds and Related Gross Realized Capital Gains and Losses From the Sale of Debt Securities
Excluding amounts related to experience-rated products, proceeds from the sale of available-for-sale debt securities and the related gross realized capital gains and losses for the three and six months ended June 30, 2021 and 2020 were as follows:
Three Months Ended
June 30,		Six Months Ended
June 30,
In millions2021202020212020
Proceeds from sales$919 $1,419 $2,267 $2,142 
Gross realized capital gains20 23 42 43 
Gross realized capital losses1 21 10 56