Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net income	$ 569	$ 657	$ 1,342	$ 2,056
Other comprehensive income, before tax:
Pension and other postretirement benefits	7	5	20	15
Other comprehensive income, before tax	7	5	26	14
Income tax expense related to items of other comprehensive income	(3)	(1)	(6)	(4)
Other comprehensive income, net of tax	4	4	20	10
Total comprehensive income	573	661	1,362	2,066
Accumulated Other Comprehensive Loss Equity Investees
Other comprehensive income, before tax:
Other comprehensive income, before tax	$ 0	$ 0	$ 6	$ (1)