Preferred And Common Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended
	Jan. 25, 2011	Jan. 24, 2011	Jun. 30, 2011
Preferred And Common Stock
Common stock contributed to pension plans	36,518,563	36,518,563
Common stock contributed to pension plan, price per share		$ 16.43
Common stock contributed to pension plan, aggregate price		$ 600
Common shares authorized			1,800,000,000
Common shares issued			1,177,906,557
Common share outstanding			1,064,103,706
Funded status of U.S. pension plan		80.00%