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Available-for-sale investments (Tables)
 6 Months Ended
Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security
The amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security were as follows (in millions):
Type of security as of June 30, 2017
 
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Estimated
fair
value
U.S. Treasury securities
 
$
7,664

 
$
9

 
$
(12
)
 
$
7,661

Other government-related debt securities:
 
 
 
 
 
 
 
 
U.S.
 
226

 
1

 
(1
)
 
226

Foreign and other
 
2,334

 
27

 
(8
)
 
2,353

Corporate debt securities:
 
 
 
 
 
 
 
 
Financial
 
9,591

 
56

 
(10
)
 
9,637

Industrial
 
9,499

 
88

 
(18
)
 
9,569

Other
 
1,229

 
8

 
(2
)
 
1,235

Residential mortgage-backed securities
 
1,689

 
1

 
(8
)
 
1,682

Other mortgage- and asset-backed securities
 
1,854

 
2

 
(3
)
 
1,853

Money market mutual funds
 
2,165

 
—

 
—

 
2,165

Other short-term interest-bearing securities
 
2,382

 
—

 
—

 
2,382

Total interest-bearing securities
 
38,633

 
192

 
(62
)
 
38,763

Equity securities
 
134

 
30

 
(5
)
 
159

Total available-for-sale investments
 
$
38,767

 
$
222

 
$
(67
)
 
$
38,922

Type of security as of December 31, 2016
 
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Estimated
fair
value
U.S. Treasury securities
 
$
6,681

 
$
1

 
$
(68
)
 
$
6,614

Other government-related debt securities:
 
 
 
 
 
 
 
 
U.S.
 
302

 
—

 
(3
)
 
299

Foreign and other
 
1,784

 
9

 
(34
)
 
1,759

Corporate debt securities:
 
 
 
 
 
 
 
 
Financial
 
8,476

 
21

 
(37
)
 
8,460

Industrial
 
8,793

 
59

 
(63
)
 
8,789

Other
 
1,079

 
5

 
(7
)
 
1,077

Residential mortgage-backed securities
 
1,968

 
1

 
(29
)
 
1,940

Other mortgage- and asset-backed securities
 
1,731

 
1

 
(13
)
 
1,719

Money market mutual funds
 
2,782

 
—

 
—

 
2,782

Other short-term interest-bearing securities
 
4,188

 
—

 
—

 
4,188

Total interest-bearing securities
 
37,784

 
97

 
(254
)
 
37,627

Equity securities
 
127

 
31

 
(4
)
 
154

Total available-for-sale investments
 
$
37,911

 
$
128

 
$
(258
)
 
$
37,781
Fair values of available-for-sale investments by classification in the Consolidated Balance Sheets
The fair values of available-for-sale investments by classification in the Condensed Consolidated Balance Sheets were as follows (in millions):
Classification in the Condensed Consolidated Balance Sheets
 
June 30,
2017
 
December 31,
2016
Cash and cash equivalents
 
$
2,165

 
$
2,783

Marketable securities
 
36,598

 
34,844

Other noncurrent assets
 
159

 
154

Total available-for-sale investments
 
$
38,922

 
$
37,781
Fair values of available-for-sale interest-bearing security investments by contractual maturity
The fair values of available-for-sale interest-bearing security investments by contractual maturity, except for mortgage- and asset-backed securities that do not have a single maturity date, were as follows (in millions):
Contractual maturity
 
June 30,
2017
 
December 31,
2016
Maturing in one year or less
 
$
6,905

 
$
8,393

Maturing after one year through three years
 
11,629

 
10,404

Maturing after three years through five years
 
13,346

 
12,157

Maturing after five years through ten years
 
3,286

 
2,974

Maturing after ten years
 
62

 
40

Mortgage- and asset-backed securities
 
3,535

 
3,659

Total interest-bearing securities
 
$
38,763

 
$
37,627
Available-for-sale securities, fair value and unrealized losses
The unrealized losses on available-for-sale investments and their related fair values were as follows (in millions):
 
 
Less than 12 months
 
12 months or greater
Type of security as of June 30, 2017
 
Fair value
 
Unrealized losses
 
Fair value
 
Unrealized losses
U.S. Treasury securities
 
$
5,784

 
$
(12
)
 
$
—

 
$
—

Other government-related debt securities:
 
 
 
 
 
 
 
 
U.S.
 
132

 
(1
)
 
—

 
—

Foreign and other
 
968

 
(8
)
 
11

 
—

Corporate debt securities:
 
 
 
 
 
 
 
 
Financial
 
2,231

 
(9
)
 
22

 
(1
)
Industrial
 
2,646

 
(18
)
 
62

 
—

Other
 
370

 
(2
)
 
5

 
—

Residential mortgage-backed securities
 
1,355

 
(6
)
 
69

 
(2
)
Other mortgage- and asset-backed securities
 
917

 
(3
)
 
8

 
—

Equity securities
 
20

 
(5
)
 
—

 
—

Total
 
$
14,423

 
$
(64
)
 
$
177

 
$
(3
)
 
 
Less than 12 months
 
12 months or greater
Type of security as of December 31, 2016
 
Fair value
 
Unrealized losses
 
Fair value
 
Unrealized losses
U.S. Treasury securities
 
$
5,774

 
$
(68
)
 
$
—

 
$
—

Other government-related debt securities:
 
 
 
 
 
 
 
 
U.S.
 
201

 
(3
)
 
—

 
—

Foreign and other
 
1,192

 
(34
)
 
17

 
—

Corporate debt securities:
 
 
 
 
 
 
 
 
Financial
 
3,975

 
(37
)
 
44

 
—

Industrial
 
3,913

 
(61
)
 
149

 
(2
)
Other
 
486

 
(7
)
 
7

 
—

Residential mortgage-backed securities
 
1,631

 
(26
)
 
158

 
(3
)
Other mortgage- and asset-backed securities
 
1,087

 
(10
)
 
118

 
(3
)
Equity securities
 
22

 
(4
)
 
—

 
—

Total
 
$
18,281

 
$
(250
)
 
$
493

 
$
(8
)