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INVESTMENTS AND RESTRICTED CASH (Tables)

12 Months Ended

Dec. 31, 2020

Investments and Cash [Abstract]

Schedule of Unrealized Loss on Investments [Table Text Block]

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, 2020 (in millions):

			Less Than 12 Months												12 Months or More												Total
			Fair Value						Unrealized Losses						Fair Value						Unrealized Losses						Fair Value						Unrealized Losses
U.S. government and agency debt securities			$	31					$	—					$	—					$	—					$	31					$	—
Mortgage and asset-backed debt securities			—						—						1						—						1						—
Corporate debt securities			16						—						—						—						16						—
Non-U.S. government debt securities			—						—						—						—						—						—
Total marketable securities			$	47					$	—					$	1					$	—					$	48					$	—

Summary of Marketable Securities

The following is a summary of marketable securities classified as trading and available-for-sale as of December 31, 2020 and 2019 (in millions):

			Cost						Unrealized Gains						Unrealized Losses						Estimated Fair Value
2020
Current trading marketable securities:
Corporate debt securities			$	—					$	—					$	—					$	—
Equity securities			2						—						—						2
Total trading marketable securities			2						—						—						2
Current available-for-sale marketable securities:
U.S. government and agency debt securities			181						3						—						184
Mortgage and asset-backed debt securities			30						1						—						31
Corporate debt securities			174						4						—						178
Non-U.S. government debt securities			11						—						—						11
Total available-for-sale marketable securities			396						8						—						404
Total current marketable securities			$	398					$	8					$	—					$	406
			Cost						Unrealized Gains						Unrealized Losses						Estimated Fair Value
2019
Current trading marketable securities:
Corporate debt securities			$	112					$	—					$	—					$	112
Equity securities			2						—						—						2
Total trading marketable securities			114						—						—						114
Current available-for-sale marketable securities:
U.S. government and agency debt securities			191						2						—						193
Mortgage and asset-backed debt securities			46						1						—						47
Corporate debt securities			130						3						—						133
Non-U.S. government debt securities			16						—						—						16
Total available-for-sale marketable securities			383						6						—						389
Total current marketable securities			$	497					$	6					$	—					$	503

Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity

The amortized cost and estimated fair value of marketable securities as of December 31, 2020, 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.

			Cost						Estimated Fair Value
Due in one year or less			$	27					$	27
Due after one year through three years			323						327
Due after three years through five years			10						10
Due after five years			36						40
			396						404
Equity securities			2						2
			$	398					$	406

Cash and Cash Equivalents and Restricted Cash

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, 2020						December 31, 2019						December 31, 2018
Cash and cash equivalents			$	5,910					$	5,238					$	4,225
Restricted cash			—						—						142
Total cash, cash equivalents and restricted cash			$	5,910					$	5,238					$	4,367

Investments Measured at Fair Value on a Recurring Basis

The following table presents information about our investments measured at fair value on a recurring basis as of December 31, 2020 and 2019, 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
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 securities			184						222						—						406
Other non-current investments			23						—						—						23
Total			$	207					$	222					$	—					$	429
			Quoted Prices in Active Markets  for Identical Assets (Level 1)						Significant Other Observable Inputs (Level 2)						Significant Unobservable Inputs (Level 3)						Total
2019
Marketable Securities:
U.S. government and agency debt securities			$	193					$	—					$	—					$	193
Mortgage and asset-backed debt securities			—						47						—						47
Corporate debt securities			—						245						—						245
Equity securities			—						2						—						2
Non-U.S. government debt securities			—						16						—						16
Total marketable securities			193						310						—						503
Other non-current investments			21						—						1						22
Total			$	214					$	310					$	1					$	525

Changes in Level 3 Instruments Measured on a Recurring Basis

There were no transfers of investments between Level 1 and Level 2 during 2020 or 2019.

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