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Cumulative Preferred Stock (Tables)
12 Months Ended
Dec. 31, 2016
Cumulative Preferred Stock [Abstract]  
Schedule of Stock by Class [Table Text Block]
Authorized:
Unlimited number of First Preferred shares, issuable in series.
Unlimited number of Second Preferred shares, issuable in series.
December 31, 2016December 31, 2015
Annual DividendRedemptionIssued andNetIssued andNet
Per SharePrice per shareOutstandingProceedsOutstandingProceeds
Series A$0.6388$25.003,864,636$ 953,864,636$ 95
Series BFloating$25.002,135,364$ 522,135,364$ 52
Series C$1.0250$25.0010,000,000$ 24510,000,000$ 245
Series E$1.1250$26.005,000,000$ 1225,000,000$ 122
Series F$1.0625$25.008,000,000$ 1958,000,000$ 195
Total$29,000,000$ 70929,000,000$ 709