Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 62	$ 59
Common stock, par value	$ 0.1	$ 0.1
Common stock, authorized	1,000,000,000	1,000,000,000
Common stock, outstanding	378,000,000	378,000,000