CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ (752)	$ 1,869	$ 514	$ 3,425
Other comprehensive income (loss) items:
Losses on derivatives	[1]	(114)	(1)	(130)	(5)
Pension and postretirement (losses) gains	[2]	(34)	144	(30)	153
Reclassification of losses on derivatives	[3]	0	10	0	13
Other comprehensive (loss) income, net of tax		(148)	153	(160)	161
Comprehensive income (loss)		(900)	2,022	354	3,586
Comprehensive income attributable to noncontrolling interests		(42)	0	(42)	0
Comprehensive income (loss) attributable to preferred and common stockholders		$ (942)	$ 2,022	$ 312	$ 3,586

[1] Net of tax of $32 million and zero for the three months ended September 30, 2019, and 2018, and $36 million and $1 million for the nine months ended September 30, 2019, and 2018, respectively.

[2] Net of tax of $10 million and $(40) million for the three months ended September 30, 2019, and 2018, and $8 million and $(43) million for the nine months ended September 30, 2019, and 2018, respectively.

[3] Net of tax of $(3) million for the three months ended September 30, 2018, and $(4) million for the nine months ended September 30, 2018, respectively.