Profit Sharing, Retirement Savings Plans and Defined Benefit Pension Plans - Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost (Details) - Pension Plan	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
U.S.
Net periodic benefit cost
Discount rate	3.30%	4.30%	3.60%
Expected long-term rate of return	6.50%	6.20%	6.20%
Cash balance interest credit rate	2.00%	3.00%	2.30%
International
Net periodic benefit cost
Discount rate	1.90%	2.60%	2.50%
Expected long-term rate of return	3.30%	4.70%	4.90%
Rate of compensation increase	2.30%	2.30%	2.30%
Cash balance interest credit rate	1.10%	1.40%	1.10%