Retirement Plans (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		5 Months Ended	9 Months Ended
	Apr. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2022	Dec. 31, 2021
Successor [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Capitalization of pension and OPEB expense			$ 6	$ 10	$ 15
OPEB Remeasurement		$ 84			234
Pension Remeasurement Gain		91			91
Predecessor [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Capitalization of pension and OPEB expense	$ 7
Pension [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Settlement threshold					169
Pension settlement costs					50
Contributions to plans					172
Pension Remeasurement Gain					91
Decrease in plan assets					(696)
Investment returns					635
Plan assets		1,959			1,959	$ 2,655
Benefit payments					233
Settlements					177
Pension [Member] | Successor [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension settlement costs		50			50
Pension Remeasurement Gain		$ 91			$ 91