Summary of Basis of Presentation and Recent Accounting Standards (Tables)

3 Months Ended

Mar. 31, 2021

Accounting Policies [Abstract]

Components of Accumulated Other Comprehensive Income

The components of accumulated other comprehensive income for the three months ended March 31, 2021 are as follows (in millions): 

	Unrealized Loss on Available-for-Sale Debt Securities
Accumulated other comprehensive income, balance at December 31, 2020	$	3
Other comprehensive loss	(2)
Accumulated other comprehensive income, balance at March 31, 2021	$	1

Reconciliation of Cash and Cash Equivalents

The following table provides a reconciliation of cash, cash equivalents and restricted cash in the condensed consolidated balance sheets that sum to the total of the same such amounts shown in the condensed consolidated statements of cash flows (in millions):

	March 31,
	2021		2020
Cash and cash equivalents	$	5,442	$	392
Restricted cash	—		1
Restricted cash, non-current	11		11
Total cash, cash equivalents and restricted cash shown in the condensed consolidated     statements of cash flows	$	5,453	$	404

Reconciliation of Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash in the condensed consolidated balance sheets that sum to the total of the same such amounts shown in the condensed consolidated statements of cash flows (in millions):

	March 31,
	2021		2020
Cash and cash equivalents	$	5,442	$	392
Restricted cash	—		1
Restricted cash, non-current	11		11
Total cash, cash equivalents and restricted cash shown in the condensed consolidated     statements of cash flows	$	5,453	$	404