Statements of Consolidated 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)	$ (1,964)	$ (7,069)	$ 3,009
Other comprehensive income (loss), net of tax:
Employee benefit plans	199	(421)	80
Investments and other	(2)	0	5
Total other comprehensive income (loss), net of tax	197	(421)	85
Total comprehensive income (loss), net	$ (1,767)	$ (7,490)	$ 3,094