Earnings Per Share (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
Earnings Per Share Details [Abstract]
Net income attributable to TWC shareholders	$ 420	$ 342	$ 745	$ 556
Less: Net income allocated to participating securities	(2)	(2)	(5)	(4)
Net income attributable to TWC common shareholders	$ 418	$ 340	$ 740	$ 552
Average basic common shares outstanding (in shares)	334.0	354.8	338.7	353.9
Dilutive effect of non-participating equity awards (in shares)	2.8	2.4	2.9	2.1
Dilutive effect of participating equity awards (in shares)	2.8	2.9	3.0	2.5
Average diluted common shares outstanding (in shares)	339.6	360.1	344.6	358.5
Net income per common share attributable to TWC common shareholders - basic (in US dollars per share)	$ 1.25	$ 0.96	$ 2.18	$ 1.56
Net income per common share attributable to TWC common shareholders - diluted (in US dollars per share)	$ 1.24	$ 0.95	$ 2.16	$ 1.55
Antidilutive securities excluded from earnings per share computation (in shares)			1.9

The sum of non-participating dilutive potential common shares used in the calculation of the diluted per-share computation.

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The sum of participating dilutive potential common shares used in the calculation of the diluted per-share computation.

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The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the common shareholders of the parent.

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The portion of consolidated profit or loss allocated to participating securities for the period, net of income taxes.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 13, 14

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The amount of net income or loss for the period per each share of common stock outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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-Paragraph 21
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The amount of net income or loss for the period per each share of common stock and dilutive common stock equivalents outstanding during the reporting period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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-Publisher SEC
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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The average number of shares issued and outstanding that are used in calculating diluted EPS, determined based on the timing of issuance of shares in the period.

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-Name Statement of Financial Accounting Standard (FAS)
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Number of [basic] shares, after adjustment for contingently issuable shares and other shares not deemed outstanding, determined by relating the portion of time within a reporting period that common shares have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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