Investments (Details 2) (USD $) In Millions, unless otherwise specified	Mar. 30, 2012	Dec. 31, 2011
Available-for-sale securities, by type
Available-for-sale Securities, Amortized Cost Basis	$ 3,782	$ 1,166
Available-for-sale Securities Unrealized Gains, Gross	395	238
Available-for-sale Securities Unrealized Losses, Gross	(46)	(3)
Available-for-sale securities, estimated fair value, total	4,131	1,401
Equity Securities
Available-for-sale securities, by type
Available-for-sale Securities, Amortized Cost Basis	939	834
Available-for-sale Securities Unrealized Gains, Gross	394	237
Available-for-sale Securities Unrealized Losses, Gross	0	0
Available-for-sale securities, estimated fair value, total	1,333	1,071
Debt Securities
Available-for-sale securities, by type
Available-for-sale Securities, Amortized Cost Basis	2,843	332
Available-for-sale Securities Unrealized Gains, Gross	1	1
Available-for-sale Securities Unrealized Losses, Gross	(46)	(3)
Available-for-sale securities, estimated fair value, total	$ 2,798	$ 330

For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading.

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

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-Name Accounting Standards Codification

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

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Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 16

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef

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+ Details

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References+ Details