Earnings per share (EPS) (Details) (USD $) In Millions, except Per Share data	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Net income	$ 672	$ 769	$ 1,338	$ 1,427
Basic EPS:
Less income allocated to RSUs	(11)	(11)	(21)	(19)
Income allocated to common stock for basic EPS calculation	661	758	1,317	1,408
Weighted average number of shares outstanding, basic (in shares)	1,156	1,208	1,161	1,221
Basic EPS (in dollars per share)	$ 0.57	$ 0.63	$ 1.13	$ 1.15
Adjustment for dilutive shares:
Stock-based compensation plans (in shares)	24	13	26	13
Diluted EPS:
Less income allocated to RSUs	(10)	(11)	(21)	(19)
Income allocated to common stock for dilutive EPS calculation	$ 662	$ 758	$ 1,317	$ 1,408
Weighted average number of shares outstanding, diluted (in shares)	1,180	1,221	1,187	1,234
Diluted EPS (in dollars per share)	$ 0.56	$ 0.62	$ 1.11	$ 1.14
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	20	97	19	97

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

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