Employee Benefit Plans (Accumulated Other Comprehensive Loss Pretax Amounts Not Yet Reflected in Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated net actuarial losses/(gains)	$ 748	$ 857
Accumulated prior service cost/(credit)	0	5
Total	748	862
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Accumulated net actuarial losses/(gains)	(16)	170
Accumulated prior service cost/(credit)	(10)	(21)
Total	$ (26)	$ 149