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Valuation of debt and equity investments and certain liabilities (Tables)
 6 Months Ended
Jun. 30, 2022
Fair Value Disclosures [Abstract]  
Investments Details of our investments are as follows:
 June 30, 2022December 31, 2021
Cash and Cash EquivalentsShort-Term InvestmentsLong-Term InvestmentsCash and Cash EquivalentsShort-Term InvestmentsLong-Term Investments
Measured at fair value:      
Money market funds$2,333 $— $— $1,824 $— $— 
Corporate obligations309 1,266 — 1,060 1,070 — 
U.S. government and agency securities438 2,971 — 642 3,388 — 
Non-U.S. government and agency securities— 348 — 300 650 — 
Mutual funds— — 11 — — 16 
Total3,080 4,585 11 3,826 5,108 16 
Other measurement basis:
Equity-method investments— — 23 — — 42 
Non-marketable investments— — 5 — — 4 
Cash on hand722 — — 805 — — 
Total$3,802 $4,585 $39 $4,631 $5,108 $62 
Aggregate Maturities of Available-for-sale Debt Investments The following table presents the aggregate maturities of our available-for-sale debt investments as of June 30, 2022:
Fair Value
One year or less$5,258 
One to two years74 
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.
 June 30, 2022December 31, 2021
 Level 1Level 2TotalLevel 1Level 2Total
Assets:      
Money market funds$2,333 $— $2,333 $1,824 $— $1,824 
Corporate obligations— 1,575 1,575 — 2,130 2,130 
U.S. government and agency securities3,309 100 3,409 3,629 401 4,030 
Non-U.S. government and agency securities— 348 348 — 950 950 
Mutual funds11 — 11 16 — 16 
Total assets$5,653 $2,023 $7,676 $5,469 $3,481 $8,950 
Liabilities:
Deferred compensation$313 $— $313 $395 $— $395 
Total liabilities$313 $— $313 $395 $— $395