Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Income Taxes [Abstract]
Income tax expense	$ 80	$ 79	$ 125	$ 154
Effective tax rate	32.30%	25.90%	29.80%	29.40%
Increase in effective tax rate from transformation cost	1.00%		1.00%
Increase in effective tax related to recognition of adjustment to prior period	2.00%
Decrease in effective tax rate as reversal of previously unrecognized benefits	3.00%		1.80%
Increase in effective tax rate due to unfavorable impact from ratification of HealthCare Reform Act				2.20%
Unrecognized tax benefits	182		182		192
Amount of unrecognized tax benefits that would affect the effective tax rate	92		92		90
Potential decrease in unrecognized tax benefits related to amortization of temporary tax differences	$ 8		$ 8

Effective income tax rate reconciliation tax benefit related to transformation cost.

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Potential decrease in unrecognized tax benefits related to amortization of temporary tax differences

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A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit that is attributable to changes in the income tax laws or rates.

+ References

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to the deduction received under enacted tax laws for Medicare prescription drug benefits.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to revisions in previously reported amounts of income tax provision.

+ References

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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