Retirement Plans and Other Retiree Benefits - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Expected benefit payments from company assets	$ 90
Global Growth and Efficiency Program
Defined Benefit Plan Disclosure [Line Items]
Charges against assets		$ 76	$ 27
Employee-Related Costs | Global Growth and Efficiency Program
Defined Benefit Plan Disclosure [Line Items]
Charges against assets	$ 3	$ 7	9
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets	5.70%
Pension Plans | United States
Defined Benefit Plan Disclosure [Line Items]
Percentage of investments in Company's common stock	0.00%	3.00%
U.S. plans assets sold to Company (in shares)	739,869	588,334
U.S. plans assets purchased to Company (in shares)	0	0
Defined Benefit Plan Dividends Received On Employer Securities	$ 0	$ 2
Expected long-term rate of return on plan assets	5.70%	6.30%
Average annual rates of return for the most recent 1-year period	15.00%
Average annual rates of return for the most recent 5-year period	9.00%
Average annual rates of return for the most recent 10-year period	8.00%
Average annual rates of return for the most recent 15-year period	7.00%
Average annual rates of return for the most recent 25-year period	7.00%
Other postretirement charges	$ 4	$ 7	9
Voluntary contributions to postretirement plans	$ 0	$ 113	67
Pension Plans | International
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets	2.93%	3.38%
Other postretirement charges	$ 0	$ 1	2
Other Retiree Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets	5.70%	6.30%
Medical cost trend rate assumed for next fiscal year	6.00%
Ultimate medical cost trend rate	4.75%
Year which ultimate medical cost trend rate is reached	2026
Other postretirement charges	$ 0	$ 0	$ 0