Receivables (Details) $ in Millions		12 Months Ended
		Dec. 31, 2019 USD ($) Countries Customers		Dec. 31, 2018 USD ($) Countries Customers		Dec. 31, 2017 USD ($)
Concentration Risk [Line Items]
Maximum Percentage Gross Trade Receivables From One Geographic Segment		10.00%		10.00%
Maximum Percentage Gross Trade Receivables From One Customer		10.00%		10.00%
NumberOfCountriesExceedReceivablesThreshold | Countries		1		1
NumberOfCustomersExceedReceivablesThreshold | Customers		0		0
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period		$ 738	[1]	$ 725	[1]	$ 175
Provision (a)	[2]	50		57		566
Other (b)	[3]	(12)		(44)		(16)
Balance at End of Period (c)	[1]	$ 776		$ 738		$ 725
UNITED STATES | Geographic Concentration Risk | Accounts Receivable
Concentration Risk [Line Items]
Concentration Risk, Percentage		36.00%		43.00%

[1] The allowance for bad debts in all years is primarily comprised of a full reserve against accounts receivable with our primary customer in Venezuela.

[2] Represents increases to allowance for bad debts charged to costs and expenses, net of recoveries.

[3] Includes write-offs, balance sheet reclassifications, and other activity.