Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Embedded derivatives measured at fair value on a recurring basis

The following tables provide fair value measurement information for embedded derivatives that are measured on a recurring basis:

millions	Fair Value Measurements Using
Embedded derivatives	Level 1		Level 2		Level 3		Netting and Collateral		Total Fair Value
As of March 31, 2021
Accrued liabilities	$	—	$	32	$	—	$	—	$	32
As of December 31, 2020
Accrued liabilities	$	—	$	64	$	—	$	—	$	64