Acquisitions and Dispositions (Acquisitions - Narrative) (Details) (Pending Acquisition of Administradora de Fondos de Pensiones Provida S.A. [Member], USD $) In Billions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Pending Acquisition of Administradora de Fondos de Pensiones Provida S.A. [Member]
Business Acquisition [Line Items]
Business Acquisition, Name of Acquired Entity	Administradora de Fondos de Pensiones Provida S.A. (“Provida”)
Business Acquisition, Percentage of Voting Interests Acquired Directly From Seller	64.32%
Business Acquisition, Percentage of Voting Interests Acquired Directly From Publicly Traded Shares	27.06%
Business Acquisition, Percentage of Voting Interests Acquired	91.38%
Payments to Acquire Businesses, Gross	$ 1.9