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Shareholders' Equity (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended		0 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	May 01, 2012 Series D Preferred Stock [Member]	Jul. 31, 2012 Series E Preferred Stock [Member]	Oct. 31, 2012 Series F Preferred Stock [Member]
Schedule Of Shareholders Equity [Line Items]
Preferred Stock, Value, Issued			$ 575	$ 1,200	$ 450
Proceeds from Issuance of Preferred Stock and Preference Stock	$ 1,679	$ 0	$ 559	$ 1,100
Preferred Stock, Dividend Rate, Percentage			5.85%	5.63%	5.20%

Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.

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- Definition

Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation.

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