Preferred Stock (Tables)

12 Months Ended

Dec. 31, 2011

Preferred Stock [Abstract]

Summary Of Issued And Outstanding Preferred Stock

(in millions, except share amounts, redemption price, and par value)	Shares Outstanding		Redemption Price		Balance
Nonredeemable $25 par value preferred stock
5.00% Series		400,000		N/A		$  10
5.50% Series		1,173,163		N/A		30
6.00% Series		4,211,662		N/A		105
Total nonredeemable preferred stock		5,784,825				$  145
Redeemable $25 par value preferred stock
4.36% Series		418,291		$  25.75		$  11
4.50% Series		611,142		26.00		15
4.80% Series		793,031		27.25		20
5.00% Series		1,778,172		26.75		44
5.00% Series A		934,322		26.75		23
Total redeemable preferred stock		4,534,958				$  113
Preferred stock						$  258