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Valuation of debt and equity investments and certain liabilities (Tables)
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Investments
Details of our investments are as follows:
 March 31, 2021December 31, 2020
Cash and Cash EquivalentsShort-Term InvestmentsLong-Term InvestmentsCash and Cash EquivalentsShort-Term InvestmentsLong-Term Investments
Measured at fair value:      
Money market funds$1,236 $ $ $886 $— $— 
Corporate obligations253 1,069  256 407 — 
U.S. government agency and Treasury securities200 3,175  1,340 3,054 — 
Mutual funds  14 — — 18 
Total1,689 4,244 14 2,482 3,461 18 
Other measurement basis:
Equity-method investments  52 — — 27 
Non-marketable equity investments  4 — — 
Cash on hand753   625 — — 
Total$2,442 $4,244 $70 $3,107 $3,461 $49 
Assets and Liabilities Accounted for at Fair Value
The following are our assets and liabilities that were accounted for at fair value on a recurring basis. These tables do not include cash on hand, assets held by our postretirement plans, or assets and liabilities that are measured at historical cost or any basis other than fair value.
 March 31, 2021December 31, 2020
 Level 1Level 2TotalLevel 1Level 2Total
Assets:      
Money market funds$1,236 $ $1,236 $886 $— $886 
Corporate obligations 1,322 1,322 — 663 663 
U.S. government agency and Treasury securities3,325 50 3,375 4,394 — 4,394 
Mutual funds14  14 18 — 18 
Total assets$4,575 $1,372 $5,947 $5,298 $663 $5,961 
Liabilities:
Deferred compensation$337 $ $337 $350 $— $350 
Total liabilities$337 $ $337 $350 $— $350 
Aggregate Maturities of Available-for-sale Debt Investments
The following table presents the aggregate maturities of our available-for-sale debt investments as of March 31, 2021:
Fair Value
One year or less$4,647 
One to two years50