Fair Value of Financial Assets and Liabilities - Fair Value Hierarchy For Financial Assets And Liabilities Measured At Fair Value (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	$ 17,588,000,000	$ 11,396,000,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	(35,000,000)	(33,000,000)
Cash
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	1,725,000,000	1,454,000,000
Cash equivalents
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	6,166,000,000	3,260,000,000
U.S. government and agency obligations
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	3,727,000,000	2,200,000,000
U.S. corporate debt securities
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	2,266,000,000	1,490,000,000
High yield corporate debt securities
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	531,000,000	519,000,000
Asset-backed securities
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments		2,000,000
Municipal obligations
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	863,000,000	1,035,000,000
Commodity derivative assets
Fair Value of Financial Assets and Liabilities [Line Items]
Commodity derivative assets	(4,000,000)	(1,000,000)
Auction rate securities
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	60,000,000	70,000,000
Foreign debt securities
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	2,155,000,000	1,279,000,000
Publicly traded equity securities
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	95,000,000	87,000,000
Strategic investments held at cost
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	379,000,000	364,000,000
Convertible debt carried at discounted cost
Fair Value of Financial Assets and Liabilities [Line Items]
Convertible debt carried at discounted cost		(2,666,000,000)
Long-term Debt
Fair Value of Financial Assets and Liabilities [Line Items]
Debt Instrument, Fair Value Disclosure	(5,419,000,000)
Foreign exchange derivative assets/liabilities
Fair Value of Financial Assets and Liabilities [Line Items]
Foreign exchange derivative assets	31,000,000	30,000,000
Foreign exchange derivative liabilities	(20,000,000)	(35,000,000)
Level 1
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	9,291,000,000	5,766,000,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
Level 1 | Cash
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	1,725,000,000	1,454,000,000
Level 1 | Cash equivalents
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	5,674,000,000	2,898,000,000
Level 1 | U.S. government and agency obligations
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	1,797,000,000	1,327,000,000
Level 1 | U.S. corporate debt securities
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments
Level 1 | High yield corporate debt securities
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments
Level 1 | Asset-backed securities
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments
Level 1 | Municipal obligations
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments
Level 1 | Commodity derivative assets
Fair Value of Financial Assets and Liabilities [Line Items]
Commodity derivative assets
Level 1 | Auction rate securities
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments
Level 1 | Foreign debt securities
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments
Level 1 | Publicly traded equity securities
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	95,000,000	87,000,000
Level 1 | Strategic investments held at cost
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments
Level 1 | Convertible debt carried at discounted cost
Fair Value of Financial Assets and Liabilities [Line Items]
Convertible debt carried at discounted cost
Level 1 | Long-term Debt
Fair Value of Financial Assets and Liabilities [Line Items]
Debt Instrument, Fair Value Disclosure	0
Level 1 | Foreign exchange derivative assets/liabilities
Fair Value of Financial Assets and Liabilities [Line Items]
Foreign exchange derivative assets
Foreign exchange derivative liabilities
Level 2
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	8,237,000,000	5,560,000,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
Level 2 | Cash
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments
Level 2 | Cash equivalents
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	492,000,000	362,000,000
Level 2 | U.S. government and agency obligations
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	1,930,000,000	873,000,000
Level 2 | U.S. corporate debt securities
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	2,266,000,000	1,490,000,000
Level 2 | High yield corporate debt securities
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	531,000,000	519,000,000
Level 2 | Asset-backed securities
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments		2,000,000
Level 2 | Municipal obligations
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	863,000,000	1,035,000,000
Level 2 | Commodity derivative assets
Fair Value of Financial Assets and Liabilities [Line Items]
Commodity derivative assets	(4,000,000)	(1,000,000)
Level 2 | Auction rate securities
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments
Level 2 | Foreign debt securities
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	2,155,000,000	1,279,000,000
Level 2 | Publicly traded equity securities
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments
Level 2 | Strategic investments held at cost
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments
Level 2 | Convertible debt carried at discounted cost
Fair Value of Financial Assets and Liabilities [Line Items]
Convertible debt carried at discounted cost		(2,666,000,000)
Level 2 | Long-term Debt
Fair Value of Financial Assets and Liabilities [Line Items]
Debt Instrument, Fair Value Disclosure	(5,419,000,000)
Level 2 | Foreign exchange derivative assets/liabilities
Fair Value of Financial Assets and Liabilities [Line Items]
Foreign exchange derivative assets	31,000,000	30,000,000
Foreign exchange derivative liabilities	(20,000,000)	(35,000,000)
Level 3
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	60,000,000	70,000,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	(35,000,000)	(33,000,000)
Level 3 | Cash
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments
Level 3 | Cash equivalents
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments
Level 3 | U.S. government and agency obligations
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments
Level 3 | U.S. corporate debt securities
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments
Level 3 | High yield corporate debt securities
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments
Level 3 | Asset-backed securities
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments
Level 3 | Municipal obligations
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments
Level 3 | Commodity derivative assets
Fair Value of Financial Assets and Liabilities [Line Items]
Commodity derivative assets
Level 3 | Auction rate securities
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	60,000,000	70,000,000
Level 3 | Foreign debt securities
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments
Level 3 | Publicly traded equity securities
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments
Level 3 | Strategic investments held at cost
Fair Value of Financial Assets and Liabilities [Line Items]
Total cash and investments	379,000,000	364,000,000
Level 3 | Convertible debt carried at discounted cost
Fair Value of Financial Assets and Liabilities [Line Items]
Convertible debt carried at discounted cost
Level 3 | Long-term Debt
Fair Value of Financial Assets and Liabilities [Line Items]
Debt Instrument, Fair Value Disclosure	0
Level 3 | Foreign exchange derivative assets/liabilities
Fair Value of Financial Assets and Liabilities [Line Items]
Foreign exchange derivative assets
Foreign exchange derivative liabilities