Pensions Benefit Plans and Other Postretirement Benefits - U.S. Plan Assets By Hierarchy (Details) - Pension Benefit Plans - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Minimum
Defined Benefit Plan Disclosure
Percentage of pension plan assets	10.00%
U.S. | Funded Plan
Defined Benefit Plan Disclosure
Plan assets at fair value	$ 1,324	$ 1,215	$ 1,094
Non-U.S. | Funded Plan
Defined Benefit Plan Disclosure
Plan assets at fair value	929	947	$ 843
Cash and cash equivalents | Non-U.S. | Funded Plan
Defined Benefit Plan Disclosure
Plan assets at fair value	$ 31	8
Equity securities | U.S. | Funded Plan
Defined Benefit Plan Disclosure
Percentage of pension plan assets	66.00%
Equity securities | Non-U.S. | Funded Plan
Defined Benefit Plan Disclosure
Percentage of pension plan assets	20.00%
Debt securities | U.S. | Funded Plan
Defined Benefit Plan Disclosure
Percentage of pension plan assets	29.00%
Debt securities | Non-U.S. | Funded Plan
Defined Benefit Plan Disclosure
Plan assets at fair value	$ 38	58
Percentage of pension plan assets	57.00%
Other | Non-U.S. | Funded Plan
Defined Benefit Plan Disclosure
Plan assets at fair value	$ 26	23
Real estate and other | U.S. | Funded Plan
Defined Benefit Plan Disclosure
Percentage of pension plan assets	5.00%
Real estate and other | Non-U.S. | Funded Plan
Defined Benefit Plan Disclosure
Percentage of pension plan assets	23.00%
Level 1 | Non-U.S. | Funded Plan
Defined Benefit Plan Disclosure
Plan assets at fair value	$ 67	63
Level 1 | Cash and cash equivalents | Non-U.S. | Funded Plan
Defined Benefit Plan Disclosure
Plan assets at fair value	31	8
Level 1 | Debt securities | Non-U.S. | Funded Plan
Defined Benefit Plan Disclosure
Plan assets at fair value	36	55
Level 2 | Non-U.S. | Funded Plan
Defined Benefit Plan Disclosure
Plan assets at fair value	28	26
Level 2 | Debt securities | Non-U.S. | Funded Plan
Defined Benefit Plan Disclosure
Plan assets at fair value	2	3
Level 2 | Other | Non-U.S. | Funded Plan
Defined Benefit Plan Disclosure
Plan assets at fair value	26	23
Fair Value Measured at Net Asset Value | Non-U.S. | Funded Plan
Defined Benefit Plan Disclosure
Plan assets at fair value	$ 834	$ 858