Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2015

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring Basis and Subject to Fair Value Disclosure Requirements

The Company’s assets measured at fair value on a recurring basis and subject to fair value disclosure requirements at September 30, 2015 and December 31, 2014 were as follows:

			Fair Value Measurements at Reporting Date Using
In millions	September 30, 2015		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Money market funds	$	414	$	414	$	—	$	—
Available-for-sale securities	13		13		—		—
Total assets at fair value	$	427	$	427	$	—	$	—

			Fair Value Measurements at Reporting Date Using
In millions	December 31, 2014		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Money market funds	$	393	$	393	$	—	$	—
Available-for-sale securities	78		78		—		—
Total assets at fair value	$	471	$	471	$	—	$	—