Receivables - Additional Information (Details) $ in Millions			12 Months Ended
	Jan. 02, 2020 USD ($)	Mar. 30, 2012 USD ($)	Dec. 31, 2019 USD ($) financial_institution	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Schedule Of Financial Receivables [Line Items]
Number of arrangement with different financial institution to sell customer receivables | financial_institution			3
Funding of customer receivables sold			$ 0	$ 0
Sale of customer receivables		$ 304
Cash received for receivables		50	995	1,016	$ 792
Deferred purchase price receivable		$ 254	246	234
Net cash funding received during the period			300
Amount of cash draws under arrangement during the period			3,558
Amount of cash repayments under arrangement during the period			(3,258)
Amount of cash draws under arrangement since inception			600	600
Amount of cash repayments under arrangement since inception			(600)	(600)
Gross amount of receivables sold under the deferred purchase program			48,383
Cash collections of other receivables			47,787
Gross cash outflows from deferred purchased receivables			6,599	6,375
Gross cash inflow from deferred purchase receivable			6,586	$ 6,328
Maximum
Schedule Of Financial Receivables [Line Items]
Funding of customer receivables sold			$ 400
Subsequent Event | Global Rolled Products
Schedule Of Financial Receivables [Line Items]
Deferred purchase price receivable	$ 282