Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Consolidated Balance Sheets (Unaudited)
Allowances for doubtful accounts	$ 482	$ 483
Common stock, par value	$ 1	$ 1
Common stock, authorized	14,000,000,000	14,000,000,000
Common stock, issued	6,495,231,088	6,495,231,088
Treasury stock, held	1,310,226,392	1,268,914,913