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Asset Impairment and Exit Costs - Movement in Exit Cost Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2020	Jun. 30, 2020	Jun. 30, 2019
Movement in exit cost liabilities
Liability balance, January 1, 2020			$ 181	$ 191
Charges, net	$ 64	$ 15		64	$ 18
Cash spent				(73)
Currency/other				(1)
Liability balance, June 30, 2020	$ 181			$ 181
Forecast [Member]
Movement in exit cost liabilities
Cash spent			$ (76)