Employee Benefit Plans - EEGH (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2	$ 1	$ 8	$ 5
Interest cost	4	6	14	16
Expected return on plan assets	(5)	(9)	(16)	(25)
Net amortization	0	(1)	(2)	(5)
Net periodic benefit cost (credit)	1	(3)	4	(9)
United States | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	7	4	22	11
Interest cost	21	23	59	69
Expected return on plan assets	(32)	(35)	(101)	(105)
Net amortization	6	8	19	25
Net periodic benefit cost (credit)	6	0	3	0
United States | Pension Plan | EEGH
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	2	0	5
Interest cost	0	3	0	8
Expected return on plan assets	0	(14)	0	(42)
Net amortization	0	1	0	5
Net periodic benefit cost (credit)	0	(8)	0	(24)
United States | Other Postretirement Plans | EEGH
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	1
Interest cost	0	1	0	3
Expected return on plan assets	0	(4)	0	(14)
Net amortization	0	(1)	0	(2)
Net periodic benefit cost (credit)	$ 0	$ (4)	$ 0	$ (12)