CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Allowance for Doubtful Accounts Receivable, Current	$ 145	$ 155
Customer relationships, accumulated amortization (in dollars)	3,909	3,641
Other intangible assets, accumulated amortization (in dollars)	$ 1,452	$ 1,401
Preferred stock-non-redeemable, par value (in dollars per share)	$ 25	$ 25
Preferred stock-non-redeemable, authorized shares (shares)	2,000	2,000
Preferred stock-non-redeemable, issued shares (shares)	7	7
Preferred stock-non-redeemable, outstanding shares (shares)	7	7
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00
Common stock, authorized shares (shares)	1,600,000	1,600,000
Common stock, shares, issued (shares)	575,113	583,637
Common Stock, Shares, Outstanding	575,113	583,637