Financial instruments measured at fair value on a recurring basis as of June 30, 2016 and December 31, 2015 are as follows (in millions):



	As of June 30, 2016						As of December 31, 2015
	Level 1		Level 2 and 3		Total		Level 1		Level 2 and 3		Total
Assets at fair value:
Long-term investment in equity securities	$	427	$	—	$	427	$	299	$	—	$	299
U.S. Treasury securities	503		—		503		449		—		449
Mutual Funds	24		—		24		29		—		29
Total assets at fair value	$	954	$	—	$	954	$	777	$	—	$	777