Schedule II - Valuation and Qualifying Accounts and Allowances Footnote to table explanation (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2019	Dec. 13, 2019	Dec. 31, 2016
Receivables, Net, Current		$ 1,130	$ 1,241
Other Non-current Assets		139	$ 365
Accounts Receivable, Allowance for Credit Loss, Recovery		16
VENEZUELA | Revenue Recognition [Member]
Receivables, Net, Current		72
Cumulative Effect of Change in Accounting Estimate	$ 230
Other Non-current Assets		158
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	329	294		$ 0	$ 129
Long [Member] | SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	$ 173	$ 171		$ 0	$ 0