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Cash and Investments, Available-for-Sale Investments (Tables)
 6 Months Ended
Jun. 28, 2014
Available-for-Sale Investments (Tables) [Abstract]  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
Available-for-sale investments at the end of each period were as follows:
 
 
 
June 28, 2014
 
December 28, 2013
(In Millions)
 
Adjusted Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
 
Adjusted Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
Asset-backed securities
 
$
10

 
$
—

 
$
(2
)
 
$
8

 
$
11

 
$
—

 
$
(2
)
 
$
9

Corporate debt
 
3,034

 
18

 
(2
)
 
3,050

 
4,254

 
15

 
(3
)
 
4,266

Financial institution instruments
 
4,206

 
5

 
(1
)
 
4,210

 
5,654

 
5

 
(1
)
 
5,658

Government debt
 
1,561

 
—

 
(1
)
 
1,560

 
1,932

 
1

 
(1
)
 
1,932

Marketable equity securities
 
3,296

 
2,748

 
—

 
6,044

 
3,340

 
2,881

 
—

 
6,221

Total available-for-sale investments
 
$
12,107

 
$
2,771

 
$
(6
)
 
$
14,872

 
$
15,191

 
$
2,902

 
$
(7
)
 
$
18,086
Available-for-sale Securities [Member]
  
Available-for-Sale Investments (Tables) [Abstract]  
Investments Classified by Contractual Maturity Date [Table Text Block]
The amortized cost and fair value of available-for-sale debt investments, by contractual maturity, as of June 28, 2014, were as follows:
(In Millions)
 
Cost     
 
Fair Value
Due in 1 year or less
 
$
6,293

 
$
6,313

Due in 1–2 years
 
1,266

 
1,265

Due in 2–5 years
 
884

 
885

Instruments not due at a single maturity date
 
368

 
365

Total
 
$
8,811

 
$
8,828