CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Accounts receivable, allowance	$ 51	$ 53
Other intangible assets, accumulated amortization	$ 1,606	$ 1,510
Common stock, share issued (in shares)	1	1
Common stock, share outstanding (in shares)	1	1
Common stock, value outstanding	$ 10,050	$ 10,050
Customer relationships
Customer relationships, accumulated amortization	$ 4,212	$ 3,822