Employee Benefit Plans (Net Periodic Defined Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Net periodic defined benefit credit	$ (7)	$ (22)
Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	8	9
Interest cost	21	16
Expected return on plan assets	(41)	(50)
Amortization of prior service credit	(4)	(4)
Amortization of net loss	8	5
Total other components of net benefit credit	(16)	(33)
Net periodic defined benefit credit	(8)	(24)
Non-Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1
Interest cost	2	1
Amortization of prior service credit	(2)	(2)
Amortization of net loss	1	2
Total other components of net benefit credit	1	1
Net periodic defined benefit credit	2	2
Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	(1)	0
Net periodic defined benefit credit	$ (1)	$ 0