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Marketable Securities
 9 Months Ended
Sep. 30, 2021
Debt Securities, Available-for-sale [Abstract]  
Marketable Securities Marketable Securities
The Company invests in asset-backed securities, certificates of deposit/time deposits, commercial paper, and other securities. The following is a summary of amounts recorded on the Consolidated Balance Sheet for marketable securities (current and non-current).
(Millions)September 30, 2021December 31, 2020
Corporate debt securities $— $7 
Commercial paper 501 237 
Certificates of deposit/time deposits 45 31 
U.S. treasury securities 305 125 
U.S. municipal securities4 4 
Current marketable securities855 404 
U.S. municipal securities 30 30 
Non-current marketable securities30 30 
Total marketable securities$885 $434 
At September 30, 2021 and December 31, 2020, gross unrealized, gross realized, and net realized gains and/or losses (pre-tax) were not material.
The balances at September 30, 2021 for marketable securities by contractual maturity are shown below. Actual maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.
(Millions) September 30, 2021
Due in one year or less $855 
Due after one year through five years 15 
Due after five years through ten years 15 
Total marketable securities $885