Retirement Plans and Other Retiree Benefits - Additional Information, U.S. Plans (Details) - Pension Plans - United States - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Percentage of investments in Company's common stock	5.00%	7.00%
U.S. plans assets sold to Company (in shares)	384,004	0
U.S. plans assets purchased to Company (in shares)	0	0
Dividends received by plans on the Company’s common stock	$ 3	$ 3