Earnings Per Common Share (EPS) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Basic and diluted:
Net income	$ 1,256	$ 1,177
Earnings allocated to participating share awards and other items.	(14)	(14)
Net income attributable to common shareholders	1,242	1,163
Denominator:
Basic: Weighted-average common stock	1,160	1,192
Add: weighted-average stock options and warrants	6	6
Diluted	1,166	1,198
Basic EPS	$ 1.07	$ 0.98
Diluted EPS	$ 1.07	$ 0.97
Earnings Per Common Share Eps 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	8	23

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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