Employee Benefit Plans (Net Periodic Costs (Components of Net Periodic Benefit Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Total recognized in OCI	$ (21)	$ (166)	$ 363
Pension Plans | Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	128	130	142
Interest cost	240	249	156
Expected return on plan assets	(358)	(324)	(298)
Amortization of prior service cost	4	4	3
Net periodic cost	14	59	3
Amortization of prior service (cost)	(4)	(4)	(3)
Current year actuarial loss/(gain)	(13)	(173)	508
Total recognized in OCI	(17)	(177)	505
Total amounts recognized in net periodic cost and OCI	(3)	(118)	508
Pension Plans | Nonqualified Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3	3
Interest cost	11	11	7
Amortization of actuarial loss/(gain)	1	1	5
Net periodic cost	15	15	15
Current year actuarial loss/(gain)		3	(44)
Amortization of actuarial gain/(loss)	(1)	(1)	(5)
Total recognized in OCI	(1)	2	(49)
Total amounts recognized in net periodic cost and OCI	14	17	(34)
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3	4
Interest cost	13	14	9
Expected return on plan assets	(11)	(10)	(6)
Amortization of actuarial loss/(gain)	(1)
Net periodic cost	4	7	7
Current year actuarial loss/(gain)	(4)	1	(30)
Amortization of actuarial gain/(loss)	1
Total recognized in OCI	(3)	1	(30)
Total amounts recognized in net periodic cost and OCI	$ 1	$ 8	$ (23)