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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Schedule of Financial Assets Measured at Fair Value on Recurring Basis
The following tables present our financial assets and financial liabilities that are measured at fair value on a recurring basis as of December 31, 2018 and December 31, 2017. We did not have any financial liabilities measured at fair value on a recurring basis as of December 31, 2017.
 
December 31, 2018
 
Total
 
Level 1
 
Level 2
 
Level 3
 
(in millions)
Assets at Fair Value
 
 
 
 
 
 
Financial investments, at fair value
$
268

 
$
133

 
$
135

 
$

Default fund and margin deposit investments
1,649

 
327

 
1,322

 

Total Assets at Fair Value
$
1,917

 
$
460

 
$
1,457

 
$

Liabilities at Fair Value
 
 
 
 
 
 
Other financial instruments
$
112

 
$

 
$
112

 
$

Total Liabilities at Fair Value
$
112

 
$

 
$
112

 
$

 
December 31, 2017
 
Total
 
Level 1
 
Level 2
 
Level 3
 
(in millions)
Assets at Fair Value
 
 
 
 
 
 
Financial investments, at fair value
$
235

 
$
135

 
$
100

 
$

Default fund and margin deposit investments
2,129

 
371

 
1,758

 

Total Assets at Fair Value
$
2,364

 
$
506

 
$
1,858

 
$