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Shareowners' Equity (Parenthetical) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Jan. 31, 2011 NBC Universal [Member]
Noncontrolling Interest [Line Items]
Percentage of Entities Outstanding Shares Purchased from Minority Owner			12.30%
NBCU share repurchase	$ 0	$ 3,070

Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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