Employee Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Cost (Reversal of Cost)	$ 5	$ 13	$ 24
Actuarial loss (gain)	15
Defined Benefit Plan, Effect of Decrease of Rate of Return on Plan Assets on Service and Interest Cost Components	3
Payment for Pension Benefits	0	0
401k Plan Company contributions	31	29	26
Payment for Pension Benefits	0	0
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components	$ 1
Company match pre 2009 hire	6.00%
Company match post 2008 hire	5.00%
Company contribution percentage to 401k for post 2008 hires	5.00%
Company contribution percent to 401k for bargaining employees	1.00%
401k Plan Company contributions	$ 31	29	26
Actuarial loss (gain)	15
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment	1	11
Actuarial loss (gain)	3	(15)
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	2	4
Actuarial loss (gain)	3	(15)
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment	0	0	0
Actuarial loss (gain)	(37)	255
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	86	69
Actuarial loss (gain)	(37)	255
Other Pension, Postretirement and Supplemental Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment	0	0	$ 0
Actuarial loss (gain)	2	(7)
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	3	3
Actuarial loss (gain)	$ 2	$ (7)