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Earnings Per Common Share (EPS) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Basic and diluted:
Net Income	$ 1,280	$ 1,256
Earnings allocated to participating share awards	(11)	(14)
Net income attributable to common shareholders	1,269	1,242
Denominator:
Basic: Weighted-average common stock	1,099	1,160
Add: Weighted-average stock options	7	6
Diluted	1,106	1,166
Basic EPS:
Net income attributable to common shareholders	$ 1.15	$ 1.07
Diluted EPS:
Income from continuing operations attributable to common shareholders	$ 1.15	$ 1.07
Earnings Per Common Share (Textuals) [Abstract]
Subordinated debentures	$ 750	$ 750
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per Share, amount	1	8

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