Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ 2,322	$ (14,831)	$ (522)
Other comprehensive income (loss) items:
Gains (losses) on derivatives	[1]	14	4	(127)
Pension and postretirement gains (losses)	[2]	67	(71)	78
Other		(1)	0	0
Other comprehensive income (loss), net of tax		80	(67)	(49)
Comprehensive income (loss)		2,402	(14,898)	(571)
Less: Comprehensive income attributable to noncontrolling interests		0	0	(145)
Comprehensive income (loss) attributable to preferred and common stockholders		$ 2,402	$ (14,898)	$ (716)

[1] Net of tax benefit (expense) of $(4), $(1) and $36 in 2021, 2020 and 2019, respectively.

[2] Net of tax benefit (expense) of $(18), $24 and $(25) in 2021, 2020 and 2019, respectively. See Note 11 - Retirement and Postretirement Benefit Plans in the Notes to Consolidated Financial Statements in Part II Item 8 of this Form 10-K for additional information.