Consolidated Statements Of Financial Position (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements Of Financial Position [Abstract]
Other assets, accumulated amortization	$ 717	$ 630
Common stock, par value	$ 5.00	$ 5.00
Common stock, shares issued	1,012,261,159	1,012,261,159