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Investments (Tables)
3 Months Ended
Mar. 31, 2017
Investments [Abstracts]  
Schedule of trading securities
The Company's trading securities were included in the following line items in our condensed consolidated balance sheets (in millions):
 
March 31,
2017

December 31, 2016

Marketable securities
$
296

$
282

Other assets
104

102

Total
$
400

$
384

Available-for-sale securities and held-to-maturity securities
As of March 31, 2017, available-for-sale securities consisted of the following (in millions):
 
 
Gross Unrealized
 
Estimated

 
Cost

Gains

Losses

 
Fair Value

Available-for-sale securities:1
 
 
 
 
 
Equity securities
$
1,287

$
666

$
(19
)
 
$
1,934

Debt securities
4,766

79

(15
)
 
4,830

Total
$
6,053

$
745

$
(34
)
 
$
6,764


1 Refer to Note 14 for additional information related to the estimated fair value.
As of December 31, 2016, available-for-sale securities consisted of the following (in millions):
 
 
Gross Unrealized
 
Estimated

 
Cost

Gains

Losses

 
Fair Value

Available-for-sale securities:1
 
 
 
 
 
Equity securities
$
1,252

$
425

$
(22
)
 
$
1,655

Debt securities
4,700

89

(31
)
 
4,758

Total
$
5,952

$
514

$
(53
)
 
$
6,413

1 Refer to Note 14 for additional information related to the estimated fair value.
Schedule of Realized Gain (Loss) [Table Text Block]
The sale and/or maturity of available-for-sale securities resulted in the following realized activity (in millions):
 
Three Months Ended
 
March 31, 2017

April 1, 2016

Gross gains
$
26

$
100

Gross losses
(7
)
(30
)
Proceeds
3,094

4,516

Investments by Balance Sheet Grouping
The Company's available-for-sale securities were included in the following line items in our condensed consolidated balance sheets (in millions):
 
March 31,
2017

December 31,
2016

Cash and cash equivalents
$
1,521

$
682

Marketable securities
2,998

3,769

Other investments
1,088

849

Other assets
1,157

1,113

Total
$
6,764

$
6,413

Contractual maturity amounts of the investment securities
The contractual maturities of these available-for-sale securities as of March 31, 2017 were as follows (in millions):
 
Cost

Estimated Fair Value

Within 1 year
$
1,996

$
1,996

After 1 year through 5 years
2,318

2,353

After 5 years through 10 years
176

193

After 10 years
276

288

Equity securities
1,287

1,934

Total
$
6,053

$
6,764