Debt and Credit Facility (Tables)

3 Months Ended

Mar. 31, 2014

Debt Disclosure [Abstract]

Summary of debt

The following table presents details of our senior notes, or the Notes:

	March 31, 2014
	(In millions)
2.375% fixed-rate notes, due 2015	$	400
2.700% fixed-rate notes, due 2018	500
2.500% fixed-rate notes, due 2022	500
	$	1,400
Unaccreted discount	(5		)
	$	1,395