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INVESTMENTS AND RESTRICTED CASH
 12 Months Ended
Dec. 31, 2021
Investments and Cash [Abstract]  
INVESTMENTS AND RESTRICTED CASH INVESTMENTS AND RESTRICTED CASH
The following is a summary of marketable securities classified as trading and available-for-sale as of December 31, 2021 and 2020 (in millions):
CostUnrealized
Gains		Unrealized
Losses		Estimated
Fair Value
2021
Current trading marketable securities:
Corporate debt securities$— $— $— $— 
Equity securities2 — — 2 
Total trading marketable securities2 — — 2 
Current available-for-sale marketable securities:
U.S. government and agency debt securities199 2 (1)200 
Mortgage and asset-backed debt securities7 — — 7 
Corporate debt securities121 — — 121 
U.S. state and local municipal debt securities5 — — 5 
Non-U.S. government debt securities3 — — 3 
Total available-for-sale marketable securities335 2 (1)336 
Total current marketable securities$337 $2 $(1)$338 
CostUnrealized
Gains		Unrealized
Losses		Estimated
Fair Value
2020
Current trading marketable securities:
Corporate debt securities$— $— $— $— 
Equity securities2 — — 2 
Total trading marketable securities2 — — 2 
Current available-for-sale marketable securities:
U.S. government and agency debt securities181 3 — 184 
Mortgage and asset-backed debt securities30 1 — 31 
Corporate debt securities174 4 — 178 
Non-U.S. government debt securities11 — — 11 
Total available-for-sale marketable securities396 8 — 404 
Total current marketable securities$398 $8 $— $406 
Total current marketable securities that were pledged as collateral for our self-insurance requirements had an estimated fair value of $336 and $404 million as of December 31, 2021 and 2020, respectively.
The gross realized gains on sales of available-for-sale marketable securities totaled $7, $5 and $8 million in 2021, 2020 and 2019, respectively. The gross realized losses on sales of available-for-sale marketable securities totaled $2, $0 and $2 million in 2021, 2020 and 2019, respectively.
There were no material impairment losses recognized on marketable securities during 2021, 2020 or 2019.
Investment Impairments
We have concluded that no material impairment losses existed as of December 31, 2021. In making this determination, we considered the financial condition and prospects of each issuer, the magnitude of the losses compared with the cost, the probability that we will be unable to collect all amounts due according to the contractual terms of the security, the credit rating of the security and our ability and intent to hold these investments until the anticipated recovery in market value occurs.

Unrealized Losses
The following table presents the age of gross unrealized losses and fair value by investment category for all securities in a loss position as of December 31, 2021 (in millions):
Less Than 12 Months12 Months or MoreTotal
Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
U.S. government and agency debt securities$145 $(1)$55 $— $200 $(1)
Mortgage and asset-backed debt securities6 — — — 6 — 
Corporate debt securities44 — 20 — 64 — 
U.S. state and local municipal debt securities5 — — — 5 — 
Total marketable securities$200 $(1)$75 $— $275 $(1)
The unrealized losses for the U.S. government and agency debt securities are primarily due to changes in market interest rates. We have both the intent and ability to hold these securities for the time necessary to recover the cost basis.
Maturity Information
The amortized cost and estimated fair value of marketable securities as of December 31, 2021, by contractual maturity, are shown below (in millions). Actual maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations with or without prepayment penalties. 
CostEstimated
Fair Value
Due in one year or less$31 $31 
Due after one year through three years304 305 
Due after three years through five years— — 
Due after five years— — 
335 336 
Equity securities2 2 
$337 $338 
Non-Current Investments and Restricted Cash
We hold an investment in a variable life insurance policy to fund benefits for the UPS Excess Coordinating Benefit Plan. The investment had a fair market value of $23 million as of both December 31, 2021 and 2020. Changes in investment fair value are recognized in Investment income (expense) and other in the statements of consolidated income. Additionally, we held cash in escrow related to the acquisition and disposition of certain assets of $3 and $2 million as of December 31, 2021 and 2020, respectively. These amounts are classified as Investments and Restricted Cash in the consolidated balance sheets.

A reconciliation of cash and cash equivalents and restricted cash from the consolidated balance sheets to the statements of consolidated cash flows is shown below (in millions):
December 31, 2021December 31, 2020December 31, 2019
Cash and cash equivalents$10,255 $5,910 $5,238 
Restricted cash— — — 
Total cash, cash equivalents and restricted cash$10,255 $5,910 $5,238 
Fair Value Measurements
Marketable securities valued utilizing Level 1 inputs include active exchange-traded equity securities and equity index funds, and most U.S. government debt securities, as these securities all have quoted prices in active markets. Marketable securities valued utilizing Level 2 inputs include asset-backed securities, corporate bonds and municipal bonds. These securities are valued using market corroborated pricing, matrix pricing or other models that utilize observable inputs such as yield curves.
The following table presents information about our investments measured at fair value on a recurring basis as of December 31, 2021 and 2020, and indicates the fair value hierarchy of the valuation techniques utilized to determine such fair value (in millions):
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)		Significant Other Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Total
2021
Marketable Securities:
U.S. government and agency debt securities$200 $— $— $200 
Mortgage and asset-backed debt securities— 7 — 7 
Corporate debt securities— 121 — 121 
U.S. state and local municipal debt securities5 — 5 
Equity securities— 2 — 2 
Non-U.S. government debt securities— 3 — 3 
Total marketable securities200 138 — 338 
Other non-current investments23 — — 23 
Total$223 $138 $— $361 
 Quoted Prices in
Active Markets 
for Identical
Assets
(Level 1)		Significant Other
Observable Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Total
2020
Marketable Securities:
U.S. government and agency debt securities$184 $— $— $184 
Mortgage and asset-backed debt securities— 31 — 31 
Corporate debt securities— 178 — 178 
Equity securities— 2 — 2 
Non-U.S. government debt securities— 11 — 11 
Total marketable securities184 222 — 406 
Other non-current investments23 — — 23 
Total$207 $222 $— $429 
There were no material transfers of investments between Level 1 and Level 2 during 2021 or 2020.