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Valuation of debt and equity investments and certain liabilities (Tables)
 3 Months Ended
Mar. 31, 2023
Fair Value Disclosures [Abstract]  
Investments Details of our investments are as follows:
 March 31, 2023December 31, 2022
Cash and Cash EquivalentsShort-Term InvestmentsLong-Term InvestmentsCash and Cash EquivalentsShort-Term InvestmentsLong-Term Investments
Measured at fair value:      
Money market funds$3,040 $— $— $1,238 $— $— 
Corporate obligations198 1,350 — 276 1,535 — 
U.S. government and agency securities748 3,570 — 680 4,234 — 
Non-U.S. government and agency securities149 148 — 149 248 — 
Mutual funds— — 10 — — 11 
Total4,135 5,068 10 2,343 6,017 11 
Other measurement basis:
Equity-method investments— — 13 — — 18 
Non-marketable investments— — 6 — — 5 
Cash on hand342 — — 707 — — 
Total$4,477 $5,068 $29 $3,050 $6,017 $34 
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, 2023:
Fair Value
One year or less$6,089 
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.
 March 31, 2023December 31, 2022
 Level 1Level 2TotalLevel 1Level 2Total
Assets:      
Money market funds$3,040 $— $3,040 $1,238 $— $1,238 
Corporate obligations— 1,548 1,548 — 1,811 1,811 
U.S. government and agency securities4,318 — 4,318 4,914 — 4,914 
Non-U.S. government and agency securities— 297 297 — 397 397 
Mutual funds10 — 10 11 — 11 
Total assets$7,368 $1,845 $9,213 $6,163 $2,208 $8,371 
Liabilities:
Deferred compensation$328 $— $328 $326 $— $326 
Total liabilities$328 $— $328 $326 $— $326