Asset Impairment Expense (Tables)

6 Months Ended

Jun. 30, 2021

Impairment or Disposal of Tangible Assets Disclosure [Abstract]

Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block]

The following table presents our asset impairment expense for the periods indicated (in millions):

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Ventanas	$	649	$	—	$	649	$	—
Puerto Rico	—		—		475		—
Angamos	155		—		155		—
Mountain View I & II	67		—		67		—
Other	1		—		(1)		6
Total	$	872	$	—	$	1,345	$	6