Employee Benefit Plans - EEGH (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4	$ 3	$ 6	$ 4
Interest cost	5	4	10	10
Expected return on plan assets	(6)	(7)	(11)	(16)
Net amortization	(1)	(3)	(2)	(4)
Net periodic benefit credit	2	(3)	3	(6)
United States | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	8	4	15	7
Interest cost	18	23	38	46
Expected return on plan assets	(36)	(35)	(69)	(70)
Net amortization	7	8	13	17
Net periodic benefit credit	(3)	0	(3)	0
United States | Pension Plan | EEGH
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	2	0	3
Interest cost	0	2	0	5
Expected return on plan assets	0	(14)	0	(28)
Net amortization	0	2	0	4
Net periodic benefit credit	0	(8)	0	(16)
United States | Other Postretirement Plans | EEGH
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	1
Interest cost	0	1	0	2
Expected return on plan assets	0	(5)	0	(10)
Net amortization	0	0	0	(1)
Net periodic benefit credit	$ 0	$ (4)	$ 0	$ (8)