Employee Benefit Plans (Reconciliation of Changes in Projected Benefit Obligation and Change in Plan Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning balance	$ 5,615
Fair value of plan assets, end balance	5,506	$ 5,615
Pension Plans | Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation at end of year	4,496	4,601
Projected benefit obligation at beginning of year	4,641	4,543
Service cost	128	130	$ 142
Interest cost	240	249	156
Actuarial (gains)/losses and changes in assumptions	(91)	45
Benefits paid	(389)	(326)
Projected benefit obligation at end of year	4,529	4,641	4,543
Fair value of plan assets, beginning balance	5,615	5,400
Actual return on plan assets	280	541
Benefits paid	(389)	(326)
Fair value of plan assets, end balance	5,506	5,615	5,400
Funded status	977	974
Noncurrent asset	977	974
Net amount recognized on the consolidated balance sheet	977	974
Prior service cost (credit)	7	11
Net actuarial loss (gain)	135	148
Amount recognized in AOCI	142	159
Pension Plans | Nonqualified Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation at end of year	205	212
Projected benefit obligation at beginning of year	217	222
Service cost	3	3	3
Interest cost	11	11	7
Actuarial (gains)/losses and changes in assumptions		3
Benefits paid	(21)	(22)
Projected benefit obligation at end of year	210	217	222
Fair value of plan assets, beginning balance
Employer contribution	21	22
Benefits paid	(21)	(22)
Fair value of plan assets, end balance
Funded status	(210)	(217)
Current liability	(24)	(23)
Noncurrent liability	(186)	(194)
Net amount recognized on the consolidated balance sheet	(210)	(217)
Net actuarial loss (gain)	32	33
Amount recognized in AOCI	32	33
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation at beginning of year	261	260
Service cost	3	3	4
Interest cost	13	14	9
Actuarial (gains)/losses and changes in assumptions	(12)	7
Participant contributions	2	2
Benefits paid	(24)	(25)
Projected benefit obligation at end of year	243	261	260
Fair value of plan assets, beginning balance	257	242
Actual return on plan assets	3	16
Employer contribution	22	22
Participant contributions	2	2
Benefits paid	(24)	(25)
Fair value of plan assets, end balance	260	257	$ 242
Funded status	17	(4)
Noncurrent asset	46	26
Current liability	(3)	(3)
Noncurrent liability	(26)	(27)
Net amount recognized on the consolidated balance sheet	17	(4)
Prior service cost (credit)	1	1
Net actuarial loss (gain)	(34)	(31)
Amount recognized in AOCI	$ (33)	$ (30)