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Fair Value
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value Fair Value
The preparation of the Company’s unaudited condensed consolidated financial statements in accordance with GAAP requires certain assets and liabilities to be reflected at their fair value and others to be reflected on another basis, such as an adjusted historical cost basis. The Company’s assets and liabilities carried at fair value have been classified within one of three levels of a hierarchy established by GAAP. The following are the levels of the hierarchy and a brief description of the type of valuation information (“valuation inputs”) that qualifies a financial asset or liability for each level:

Level 1 – Unadjusted quoted prices for identical assets or liabilities in active markets.
Level 2 – Valuation inputs other than Level 1 that are based on observable market data.  These include: quoted prices for similar assets in active markets, quoted prices for identical assets in inactive markets, valuation inputs that are observable that are not prices (such as interest rates and credit risks) and valuation inputs that are derived from or corroborated by observable markets.
Level 3 – Developed from unobservable data, reflecting the Company’s assumptions.

For a description of the methods and assumptions that are used to estimate the fair value and determine the fair value hierarchy classification of each class of financial instrument, see Note 4 “Fair Value” in the 2020 Form 10-K.
There were no financial liabilities measured at fair value on a recurring basis on the condensed consolidated balance sheets at March 31, 2021 or December 31, 2020. Financial assets measured at fair value on a recurring basis on the condensed consolidated balance sheets at March 31, 2021 and December 31, 2020 were as follows:
In millionsLevel 1Level 2Level 3Total
March 31, 2021    
Cash and cash equivalents$1,913 $3,685 $— $5,598 
Debt securities:    
U.S. government securities2,256 50 — 2,306 
States, municipalities and political subdivisions— 2,916 — 2,916 
U.S. corporate securities— 9,282 42 9,324 
Foreign securities— 2,858 — 2,858 
Residential mortgage-backed securities— 762 — 762 
Commercial mortgage-backed securities— 985 — 985 
Other asset-backed securities— 2,323 — 2,323 
Redeemable preferred securities— 29 30 
Total debt securities2,256 19,205 43 21,504 
Equity securities15 — 30 45 
Total$4,184 $22,890 $73 $27,147 
December 31, 2020    
Cash and cash equivalents$3,985 $3,869 $— $7,854 
Debt securities:    
U.S. government securities2,370 99 — 2,469 
States, municipalities and political subdivisions— 2,727 2,728 
U.S. corporate securities— 8,842 52 8,894 
Foreign securities— 2,918 — 2,918 
Residential mortgage-backed securities— 705 — 705 
Commercial mortgage-backed securities— 1,046 — 1,046 
Other asset-backed securities— 2,403 — 2,403 
Redeemable preferred securities— 24 25 
Total debt securities2,370 18,764 54 21,188 
Equity securities17 — 30 47 
Total$6,372 $22,633 $84 $29,089 

During the three months ended March 31, 2021 and 2020, there were no transfers into or out of Level 3.
The carrying value and estimated fair value classified by level of fair value hierarchy for financial instruments carried on the condensed consolidated balance sheets at adjusted cost or contract value at March 31, 2021 and December 31, 2020 were as follows:
Carrying
Value
 Estimated Fair Value
In millionsLevel 1Level 2Level 3Total
March 31, 2021
Assets: 
Mortgage loans$997 $— $— $1,011 $1,011 
Equity securities (1)
194 N/AN/AN/AN/A
Liabilities:
Investment contract liabilities:
With a fixed maturity— — 
Without a fixed maturity322 — — 353 353 
Long-term debt61,692 68,890 — — 68,890 
December 31, 2020
Assets: 
Mortgage loans$1,047 $— $— $1,070 $1,070 
Equity securities (1)
145 N/AN/AN/AN/A
Liabilities:  
Investment contract liabilities:  
With a fixed maturity— — 
Without a fixed maturity322 — — 371 371 
Long-term debt64,647 75,940 — — 75,940 
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(1)It was not practical to estimate the fair value of these cost-method investments as it represents shares of unlisted companies.

Separate Accounts assets relate to the Company’s large case pensions products which represent funds maintained to meet specific objectives of contract holders. Since contract holders bear the investment risk of these assets, a corresponding Separate Accounts liability has been established equal to the assets. These assets and liabilities are carried at fair value. Separate Accounts financial assets as of March 31, 2021 and December 31, 2020 were as follows:
 March 31, 2021December 31, 2020
In millionsLevel 1Level 2Level 3TotalLevel 1Level 2Level 3Total
Cash and cash equivalents$$249 $— $254 $$186 $— $188 
Debt securities1,084 2,655 — 3,739 1,465 2,634 — 4,099 
Equity securities— — — — 
Common/collective trusts— 480 — 480 — 563 — 563 
Total (1)
$1,089 $3,386 $— $4,475 $1,467 $3,385 $— $4,852 
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(1)Excludes $217 million and $29 million of other receivables at March 31, 2021 and December 31, 2020, respectively.