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Investments (Tables)
 12 Months Ended
Dec. 29, 2018
Debt Securities, Available-for-sale [Line Items]  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
 
 
December 29, 2018
 
December 30, 2017

(In Millions)
 
Adjusted
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
Adjusted
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Corporate debt
 
$
3,068

 
$
2

 
$
(28
)
 
$
3,042

 
$
2,294

 
$
4

 
$
(13
)
 
$
2,285

Financial institution instruments
 
3,076

 
3

 
(11
)
 
3,068

 
3,387

 
3

 
(9
)
 
3,381

Government debt
 
1,069

 
1

 
(9
)
 
1,061

 
961

 
—

 
(6
)
 
955

Total available-for-sale debt investments
 
$
7,213

 
$
6

 
$
(48
)
 
$
7,171

 
$
6,642

 
$
7

 
$
(28
)
 
$
6,621
Investment [Table Text Block]
(In Millions)
 
Dec 29,
2018
 
Dec 30,
2017
Marketable equity securities
 
$
1,440

 
$
4,192

Non-marketable equity securities
 
2,978

 
2,613

Equity method investments
 
1,624

 
1,774

Total
 
$
6,042

 
$
8,579
Gain (Loss) on Securities [Table Text Block]
Gains and losses for our marketable and non-marketable equity securities during the period were as follows:
(In Millions)
 
Dec 29,
2018
Net gains (losses) recognized during the period on equity securities
 
$
298

Less: Net (gains) losses recognized during the period on equity securities sold during the period
 
(445
)
Unrealized gains (losses) recognized during the period on equity securities still held at the reporting date
 
$
(147
)
The components of gains (losses) on equity investments, net for each period were as follows:
Years Ended
(In Millions)
 
Dec 29,
2018
 
Dec 30,
2017
 
Dec 31,
2016
Ongoing mark-to-market adjustments on marketable equity securities1
 
$
(129
)
 
$
—

 
$
—

Observable price adjustments on non-marketable equity securities1
 
202

 
—

 
—

Impairment charges
 
(424
)
 
(833
)
 
(187
)
Sale of equity investments and other 2
 
226

 
3,484

 
693

Total gains (losses) on equity investments, net
 
$
(125
)

$
2,651


$
506
Equity Method Investments [Table Text Block]
Equity method investments at the end of each period were as follows:
 
 
December 29, 2018
 
December 30, 2017
(Dollars In Millions)
 
Carrying
Value
 
Ownership
Percentage
 
Carrying
Value
 
Ownership
Percentage
IM Flash Technologies, LLC
 
$
1,574

 
49
%
 
$
1,505

 
49
%
McAfee
 
—

 
49
%
 
153

 
49
%
Other equity method investments
 
50

 
 
 
116

 
 
Total
 
$
1,624

 
 
 
$
1,774

 
 
Available-for-sale Securities [Member]  
Debt Securities, Available-for-sale [Line Items]  
Investments Classified by Contractual Maturity Date [Table Text Block]
The fair values of available-for-sale debt investments by contractual maturity as of December 29, 2018 were as follows:
(In Millions)
 
Fair Value
Due in 1 year or less
 
$
3,233

Due in 1–2 years
 
404

Due in 2–5 years
 
2,776

Due after 5 years
 
208

Instruments not due at a single maturity date
 
550

Total
 
$
7,171