Pension and Other Post-Employment Benefits (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Mar. 11, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and OPEB prior service costs amortized out of AOCI			$ 1	$ 1	$ 2
Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service costs		$ 46	48	92	97
Interest costs		68	57	136	113
Expected return on plan assets		(164)	(163)	(328)	(326)
Amortization of prior service costs (credits)		0	1	1	2
Net periodic benefit credits		(50)	(57)	(99)	(114)
Net periodic benefit credits, net of amounts capitalized		(72)	(85)	(141)	(163)
Estimated return	7.50%
OPEB
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service costs		1	1	2	2
Interest costs		2	2	5	5
Expected return on plan assets		(10)	(7)	(20)	(17)
Amortization of prior service costs (credits)		(2)	(5)	(5)	(9)
Net periodic benefit credits		(9)	(9)	(18)	(19)
Net periodic benefit credits, net of amounts capitalized		$ (10)	$ (10)	$ (19)	$ (20)