Condensed Consolidated Statement of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating Activities
Net cash provided by (used in) operating activities	$ 4,369	$ 4,393
Investing Activities
Capital expenditures	(1,361)	(1,174)
Cash paid for intangible assets	(182)	(184)
Acquisition of 30 Rockefeller Plaza properties	(1,311)
Proceeds from sales of businesses and investments	74	35
Return of capital from investees	16
Purchases of investments	(88)	(62)
Other	89	36
Net cash provided by (used in) investing activities	(2,763)	(1,349)
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	491	(407)
Proceeds from borrowings	2,933
Repurchases and repayments of debt	(1,811)	(1,125)
Repurchases and retirements of common stock	(500)	(750)
Dividends paid	(429)	(304)
Issuances of common stock	13	150
Purchase of NBCUniversal noncontrolling common equity interest	(10,747)
Distributions to noncontrolling interests	(49)	(58)
Settlement of Station Venture liability	(602)
Other	(17)	37
Net cash provided by (used in) financing activities	(10,718)	(2,457)
Increase (decrease) in cash and cash equivalents	(9,112)	587
Cash and cash equivalents, beginning of period	10,951	1,620
Cash and cash equivalents, end of period	$ 1,839	$ 2,207