Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Schedule of Financial Assets Measured at Fair Value on Recurring Basis

The following table presents our financial assets that are measured at fair value on a recurring basis as of September 30, 2017 and December 31, 2016. We did not have any financial liabilities measured at fair value on a recurring basis as of September 30, 2017 and December 31, 2016.

	September 30, 2017
	Total		Level 1		Level 2		Level 3
	(in millions)
Financial investments, at fair value	$	207	$	134	$	73	$	—
Default fund and margin deposit investments	1,905		252		1,653		—
Total	$	2,112	$	386	$	1,726	$	—

	December 31, 2016
	Total		Level 1		Level 2		Level 3
	(in millions)
Financial investments, at fair value	$	245	$	151	$	94	$	—
Default fund and margin deposit investments	1,900		614		1,286		—
Total	$	2,145	$	765	$	1,380	$	—