Segment Information - Geographic Concentration (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Concentration Risk
Net sales	$ 7,126	$ 6,840	$ 6,583
Net sales \| Geographic concentration \| Colombia
Concentration Risk
Net sales	$ 812	$ 778	$ 757
Concentration risk (as a percent)	11.00%	11.00%	11.00%
Net sales \| Geographic concentration \| South Africa
Concentration Risk
Net sales	$ 743	$ 668	$ 589
Concentration risk (as a percent)	10.00%	10.00%	9.00%

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details