CONSOLIDATED AND SECTOR BALANCE SHEET (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Common Stock [Member]
EQUITY
Common Stock, par value (in dollars per share)	$ 0.01
Common Stock, shares issued (in shares)	3,899
Class B Stock [Member]
EQUITY
Common Stock, par value (in dollars per share)	$ 0.01
Common Stock, shares issued (in shares)	71
Automotive [Member]
ASSETS
Allowance for receivables	$ 123	$ 115