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Short-term and Long-term Investments, Restricted Deposits (Tables)

12 Months Ended

Dec. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Short-term and long-term investments and restricted deposits by investment type

Short-term and long-term investments and restricted deposits by investment type consist of the following ($ in millions):

			December 31, 2022																								December 31, 2021
			Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value						Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value
Debt securities:
U.S. Treasury securities and obligations of U.S. government corporations and agencies			$	695					$	—					$	(16)					$	679					$	642					$	—					$	(2)					$	640
Corporate securities			10,127						12						(778)						9,361						8,145						130						(75)						8,200
Restricted certificates of deposit			4						—						—						4						4						—						—						4
Restricted cash equivalents			256						—						—						256						96						—						—						96
Short-term time deposits			204						—						—						204						109						—						—						109
Municipal securities			4,055						6						(280)						3,781						3,398						85						(15)						3,468
Asset-backed securities			1,396						—						(70)						1,326						1,308						5						(5)						1,308
Residential mortgage-backed securities			1,165						2						(121)						1,046						850						10						(7)						853
Commercial mortgage-backed securities			961						—						(99)						862						870						13						(10)						873
Equity securities (1)			5						—						—						5						326						—						—						326
Private equity investments			529						—						—						529						587						—						—						587
Life insurance contracts			169						—						—						169						186						—						—						186
Total			$	19,566					$	20					$	(1,364)					$	18,222					$	16,521					$	243					$	(114)					$	16,650
(1) Investments in equity securities as of December 31, 2021 primarily consisted of exchange traded funds in fixed income securities.

Schedule of Fair value of available-for-sale debt securities with gross unrealized losses by investment type in a continuous unrealized loss position

The fair value of available-for-sale debt securities with gross unrealized losses by investment type and length of time that individual securities have been in a continuous unrealized loss position were as follows ($ in millions):

			December 31, 2022																								December 31, 2021
			Less Than 12 Months												12 Months or More												Less Than 12 Months												12 Months or More
			Unrealized Losses						Fair Value						Unrealized Losses						Fair Value						Unrealized Losses						Fair Value						Unrealized Losses						Fair Value
U.S. Treasury securities and obligations of U.S. government corporations and agencies			$	(5)					$	342					$	(11)					$	184					$	(2)					$	598					$	—					$	3
Corporate securities			(340)						5,368						(438)						3,400						(66)						4,209						(9)						209
Municipal securities			(142)						2,437						(138)						995						(14)						1,173						(1)						39
Asset-backed securities			(29)						786						(41)						486						(5)						770						—						33
Residential mortgage-backed securities			(55)						629						(66)						352						(7)						472						—						15
Commercial mortgage-backed securities			(49)						513						(50)						330						(8)						380						(2)						32
Total			$	(620)					$	10,075					$	(744)					$	5,747					$	(102)					$	7,602					$	(12)					$	331

Contractual maturities of short-term and long-term investments and restricted deposits

The contractual maturities of short-term and long-term debt securities and restricted deposits are as follows ($ in millions):

			December 31, 2022																								December 31, 2021
			Investments												Restricted Deposits												Investments												Restricted Deposits
			Amortized Cost						Fair Value						Amortized Cost						Fair Value						Amortized Cost						Fair Value						Amortized Cost						Fair Value
One year or less			$	2,207					$	2,179					$	534					$	532					$	1,390					$	1,396					$	368					$	368
One year through five years			7,651						7,147						524						490						6,212						6,294						460						457
Five years through ten years			4,066						3,613						224						195						3,647						3,681						244						243
Greater than ten years			135						129						—						—						73						78						—						—
Asset-backed securities			3,522						3,234						—						—						3,028						3,034						—						—
Total			$	17,581					$	16,302					$	1,282					$	1,217					$	14,350					$	14,483					$	1,072					$	1,068

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Short-term and long-term investments and restricted deposits by investment type

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Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 55
-Paragraph 8
-URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455

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Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments.

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