Pensions Benefit Plans and Other Postretirement Benefits - Components of Net Periodic Pension and Postretirement Cost (Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other:
Pension settlement charges	$ (26)	$ (26)	$ (74)
Pension Benefit Plans | Funded Plan
Other:
Accumulated benefit obligation	2,692	2,622
Pension Benefit Plans | U.S. | Funded Plan
Components of net periodic pension cost
Service cost	11	12	14
Interest cost	50	58	59
Expected asset return	(85)	(86)	(98)
Amortization:
Actuarial (gain) loss	56	41	51
Net (income) expense	32	25	26
Other:
Pension settlement charges	14	17	61
Annuity contract purchase for settlement of pension obligation			94
Pension Benefit Plans | Non-U.S. | Funded Plan
Components of net periodic pension cost
Service cost	13	12	15
Interest cost	26	33	32
Expected asset return	(45)	(48)	(52)
Amortization:
Actuarial (gain) loss	12	10	11
Net (income) expense	6	7	6
Pension Benefit Plans | Canadian Pension Plans | Funded Plan
Other:
Pension settlement charges	8
Annuity contract purchase for settlement of pension obligation	31
Pension Benefit Plans | Pension Plan of the United Kingdom | Funded Plan
Other:
Pension settlement charges		7	13
Pension Benefit Plans | Pension Plan of Mexico | Funded Plan
Other:
Pension settlement charges	4	2
Other Post-retirement Benefits | U.S. | Funded Plan
Components of net periodic pension cost
Interest cost	2	4	3
Amortization:
Actuarial (gain) loss	(11)	1	2
Prior service cost	5	(8)	(7)
Net amortization	(6)	(7)	(5)
Net (income) expense	(4)	(3)	(2)
Other Post-retirement Benefits | Non-U.S. | Funded Plan
Components of net periodic pension cost
Service cost	2	1	1
Interest cost	2	3	3
Amortization:
Prior service cost	(1)
Net amortization	(1)
Net (income) expense	$ 3	$ 4	$ 4