Reclassifications From Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reclassifications from accumulated other comprehensive (loss) income
Selling, general and administrative expenses	$ 331	$ 341	$ 1,019	$ 1,024
Interest expense	54	57	171	169
Tax (benefit)	77	(415)	219	(377)
Net of tax	111	543	280	756
Actuarial losses, net | Amount Reclassified
Reclassifications from accumulated other comprehensive (loss) income
Selling, general and administrative expenses	6	3	16	9
Tax (benefit)	(2)	$ (3)	(5)	(3)
Net of tax	$ 4		11	6
Interest rate swaps. | Amount Reclassified
Reclassifications from accumulated other comprehensive (loss) income
Interest expense			1	1
Net of tax			$ 1	$ 1