Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures).

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Summary of Significant Accounting Policies Major Customers and Credit Risk (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	12 Months Ended
	Dec. 31, 2016	Jun. 30, 2016	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Concentration Risk [Line Items]
Concentration percentage				100.00%	100.00%	100.00%
Receivable with Imputed Interest, Face Amount		$ 120	$ 120
Trade Receivables Held-for-sale, Reconciliation to Cash Flow, Deductions from Held-for-sale		120
Receivable With Imputed Interest, Term			3 years
Receivable with Imputed Interest, Effective Yield (Interest Rate)			6.50%
Financing Receivable, Allowance for Credit Losses, Write-downs		$ 84		$ 76
Proceeds from Sale of Notes Receivable	$ 44
Gain (Loss) on Sale of Notes Receivable	$ 8
Concentration Risk, Customer				no	0	0
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Venezuela Customer [Member]
Concentration Risk [Line Items]
Concentration percentage				43.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Ecuador Customer [Member]
Concentration Risk [Line Items]
Concentration percentage				16.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Mexico Customer [Member]
Concentration Risk [Line Items]
Concentration percentage				10.00%
Accounts Receivable [Member] \| Latin America [Member] \| Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration percentage				38.00%
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration percentage				10.00%	10.00%	10.00%