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FAIR VALUE
6 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
FAIR VALUE FAIR VALUE
Financial Assets
The following table summarizes our fair value measurements at June 30, 2021 and December 31, 2020, respectively, for financial assets measured at fair value on a recurring basis:
 Fair Value Measurements Using
 Fair
Value
Quoted Prices
in Active
Markets
(Level 1)
Other
Observable
Inputs
(Level 2)
Unobservable
Inputs
(Level 3)
 (in millions)
June 30, 2021
Cash equivalents$3,191 $3,191 $— $— 
Debt securities:
U.S. Treasury and other U.S. government
    corporations and agencies:
U.S. Treasury and agency obligations641 — 641 — 
Mortgage-backed securities3,530 — 3,530 — 
Tax-exempt municipal securities1,094 — 1,094 — 
Mortgage-backed securities:
Residential256 — 256 — 
Commercial1,453 — 1,453 — 
Asset-backed securities1,458 — 1,458 — 
Corporate debt securities5,428 — 5,428 — 
Total debt securities13,860 — 13,860 — 
Common stock793 793 — — 
Total invested assets$17,844 $3,984 $13,860 $— 
December 31, 2020
Cash equivalents$4,548 $4,548 $— $— 
Debt securities:
U.S. Treasury and other U.S. government
    corporations and agencies:
U.S. Treasury and agency obligations616 — 616 — 
Mortgage-backed securities3,254 — 3,254 — 
Tax-exempt municipal securities1,447 — 1,447 — 
Mortgage-backed securities:
Residential17 — 17 — 
Commercial1,318 — 1,318 — 
Asset-backed securities1,372 — 1,372 — 
Corporate debt securities4,927 — 4,927 — 
Total debt securities12,951 — 12,951 — 
Common stock815 815 — — 
Total invested assets$18,314 $5,363 $12,951 $— 
Financial Liabilities
Our debt is recorded at carrying value in our consolidated balance sheets. The carrying value of our senior notes debt outstanding, net of unamortized debt issuance costs, was $6.1 billion at June 30, 2021 and December 31, 2020. The fair value of our senior notes debt was $7.1 billion at June 30, 2021 and $7.4 billion at December 31, 2020. The fair value of our senior notes debt is determined based on Level 2 inputs, including quoted market prices for the same or similar debt, or if no quoted market prices are available, on the current prices estimated to be available to us for debt with similar terms and remaining maturities. Due to the short-term nature, carrying value approximates fair value for our term note and commercial paper borrowings. The commercial paper borrowings were $1.1 billion and $0.6 billion as of June 30, 2021 and December 31, 2020, respectively.
Put and Call Options Measured at Fair Value
Effective April 27, 2021, with the signing of the definitive agreement to acquire the remaining 60% interest of KAH, the put and call options were terminated. As such, the $63 million put and $440 million call fair values as of the first quarter of 2021 were reduced to zero, resulting in $377 million in "Other (income) expense, net" in our condensed consolidated statements of income during the three months ended June 30, 2021.
The put and call options were measured at fair value using a Monte Carlo simulation which resulted in fair values of $45 million and $503 million, respectively, at December 31, 2020. The put option is included within other long-term liabilities and the call option is included within other long-term assets at December 31, 2020. The change in fair value of the put and call options is reflected as "Other (income) expense, net" in our condensed consolidated statements of income.

Other Assets and Liabilities Measured at Fair Value

Other than the immaterial assets acquired and liabilities assumed in the acquisitions in Note 3, there were no other material assets or liabilities measured at fair value on a recurring or nonrecurring basis during 2021.