Employee Benefit Plans - PAC - Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other Postretirement
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 11	$ 12	$ 7
Interest cost	20	19	21
Expected return on plan assets	(29)	(22)	(34)
Settlement	0	0	0
Net amortization	(1)	(3)	(4)
Net periodic benefit cost (credit)	1	6	(10)
Other Postretirement | PAC
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	2	2
Interest cost	8	7	9
Expected return on plan assets	(11)	(9)	(14)
Settlement	0	0	0
Net amortization	1	1	3
Net periodic benefit cost (credit)	0	1	0
U.S. | Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	22	30	17
Interest cost	83	78	93
Expected return on plan assets	(108)	(134)	(140)
Settlement	17	3	0
Net amortization	19	25	32
Net periodic benefit cost (credit)	23	2	2
U.S. | Pension | PAC
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0
Interest cost	29	29	36
Expected return on plan assets	(42)	(51)	(56)
Settlement	6	6	0
Net amortization	16	21	18
Net periodic benefit cost (credit)	9	5	$ (2)
Settlement losses, gross	24	15
Settlement losses, regulatory deferrals	$ 18	$ 9