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Available-for-Sale Debt Securities (Tables)

12 Months Ended

Dec. 31, 2020

Debt Securities, Available-for-sale [Abstract]

Summary of Available-for-Sale Debt Securities at Estimated Fair Value

The following table summarizes our available-for-sale debt securities:

						December 31, 2020																								December 31, 2019
(in millions)						Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Estimated Fair Value						Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Estimated Fair Value
U.S. treasury securities						$	308					$	1					$	—					$	309					$	2,433					$	—					$	—					$	2,433
Certificates of deposit						216						—						—						216						3,517						—						—						3,517
U.S. government agencies securities						—						—						—						—						1,081						—						—						1,081
Non-U.S. government securities						43						—						—						43						174						—						—						174
Corporate debt securities						1,140						2						—						1,142						9,203						2						(1)						9,204
Residential mortgage and asset-backed securities						316						—						—						316						91						—						—						91
Total						$	2,023					$	3					$	—					$	2,026					$	16,499					$	2					$	(1)					$	16,500

Summary of the Classification of Available-for-Sale Debt Securities

The following table summarizes the classification of our available-for-sale debt securities in our Consolidated Balance Sheets:

(in millions)						December 31, 2020						December 31, 2019
Cash and cash equivalents						$	113					$	2,291
Short-term marketable securities						1,411						12,721
Long-term marketable securities						502						1,488
Total						$	2,026					$	16,500

Summary of Available-for-Sale Debt Securities by Contractual Maturity

The following table summarizes our available-for-sale debt securities by contractual maturity:

						December 31, 2020
(in millions)						Amortized Cost						Fair Value
Within one year						$	1,522					$	1,524
After one year through five years						489						490
After five years						12						12
Total						$	2,023					$	2,026

Summary of Available-for-Sale Debt in an Unrealized Loss Position

The following table summarizes our available-for-sale debt securities in an unrealized loss position:

						Less Than 12 Months												12 Months or Greater												Total
(in millions)						Gross Unrealized Losses						Estimated Fair Value						Gross Unrealized Losses						Estimated Fair Value						Gross Unrealized Losses						Estimated Fair Value
December 31, 2019
Corporate debt securities						$	(1)					$	1,866					$	—					$	4					$	(1)					$	1,870

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Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-URI http://asc.fasb.org/topic&trid=2196928

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Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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