Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis

Our assets and liabilities that were measured at fair value on a recurring basis were as follows (in millions):

	June 30, 2021								December 31, 2020
	Fair Value		Level I		Level II		Level III		Fair Value		Level I		Level II		Level III
Money market funds (cash and    cash equivalents)	$	11,477	$	11,477	$	—	$	—	$	13,847	$	13,847	$	—	$	—
Interest rate swap liabilities		37		—		37		—		58		—		58		—
Total	$	11,514	$	11,477	$	37	$	—	$	13,905	$	13,847	$	58	$	—

Schedule of Interest Rate Swaps Outstanding

Our interest rate swaps outstanding were as follows (in millions):

	June 30, 2021						December 31, 2020
	Aggregate Notional Amount		Gross Asset at Fair Value		Gross Liability at Fair Value		Aggregate Notional Amount		Gross Asset at Fair Value		Gross Liability at Fair Value
Interest rate swaps	$	317	$	—	$	37	$	554	$	—	$	58

Our interest rate swaps activity was as follows (in millions):

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Gross losses	$	9	$	3	$	9	$	42
Gross gains	$	—	$	—	$	20	$	—

Schedule of Estimated Fair Values and Carrying Values

The following table presents the estimated fair values and the carrying values (in millions):

	June 30, 2021				December 31, 2020
	Carrying Value		Fair Value		Carrying Value		Fair Value
Convertible Senior Notes	$	304	$	3,271	$	1,971	$	24,596
2025 Notes	$	1,787	$	1,861	$	1,785	$	1,877
Solar Asset-backed Notes	$	1,095	$	1,116	$	1,115	$	1,137
Solar Loan-backed Notes	$	128	$	136	$	146	$	152