Reclassifications From Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Reclassifications from accumulated other comprehensive (loss) income
Actuarial losses, net of tax	$ (3)	$ (4)	$ (9)	$ (11)
Interest rate swaps, net of Tax	0	0	1	1
Available-for-sale securities, net of Tax	0	0	(1)	0
Selling, general and administrative expenses
Reclassifications from accumulated other comprehensive (loss) income
Actuarial losses, net	6	6	14	16
Tax (benefit)	(3)	(2)	(5)	(5)
Actuarial losses, net of tax	3	4	9	11
Reclassification out of Accumulated Other Comprehensive Income | Interest expense
Reclassifications from accumulated other comprehensive (loss) income
Interest rate swaps	0	0	1	1
Tax (benefit)	0	0	0	0
Interest rate swaps, net of Tax	0	0	1	1
Reclassification out of Accumulated Other Comprehensive Income | Other, net
Reclassifications from accumulated other comprehensive (loss) income
Available-for-sale securities	0	0	(1)	0
Tax expense	0	0	0	0
Available-for-sale securities, net of Tax	$ 0	$ 0	$ (1)	$ 0