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Available-for-sale investments (Tables)
 9 Months Ended
Sep. 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 fair values of available-for-sale investments by type of security were as follows (in millions):
Type of security as of September 30, 2017
 
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair
value
U.S. Treasury securities
 
$
8,029

 
$
6

 
$
(17
)
 
$
8,018

Other government-related debt securities:
 
 
 
 
 
 
 
 
U.S.
 
225

 
—

 
(1
)
 
224

Foreign and other
 
2,634

 
41

 
(4
)
 
2,671

Corporate debt securities:
 
 
 
 
 
 
 
 
Financial
 
10,198

 
63

 
(7
)
 
10,254

Industrial
 
9,829

 
94

 
(17
)
 
9,906

Other
 
1,251

 
12

 
(2
)
 
1,261

Residential mortgage-backed securities
 
2,212

 
2

 
(10
)
 
2,204

Other mortgage- and asset-backed securities
 
2,071

 
—

 
(4
)
 
2,067

Money market mutual funds
 
2,455

 
—

 
—

 
2,455

Other short-term interest-bearing securities
 
1,746

 
—

 
—

 
1,746

Total interest-bearing securities
 
40,650

 
218

 
(62
)
 
40,806

Equity securities
 
129

 
27

 
(13
)
 
143

Total available-for-sale investments
 
$
40,779

 
$
245

 
$
(75
)
 
$
40,949

Type of security as of December 31, 2016
 
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
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
 
September 30,
2017
 
December 31,
2016
Cash and cash equivalents
 
$
2,455

 
$
2,783

Marketable securities
 
38,351

 
34,844

Other noncurrent assets
 
143

 
154

Total available-for-sale investments
 
$
40,949

 
$
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
 
September 30,
2017
 
December 31,
2016
Maturing in one year or less
 
$
6,478

 
$
8,393

Maturing after one year through three years
 
12,912

 
10,404

Maturing after three years through five years
 
13,830

 
12,157

Maturing after five years through ten years
 
3,252

 
2,974

Maturing after ten years
 
63

 
40

Mortgage- and asset-backed securities
 
4,271

 
3,659

Total interest-bearing securities
 
$
40,806

 
$
37,627
Available-for-sale securities, continuous unrealized loss position, fair value
Information on the fair values and gross unrealized losses of available-for-sale investments in an unrealized loss position aggregated by type and length of time that the securities have been in a continuous loss position was as follows (in millions):
 
 
Less than 12 months
 
12 months or more
Type of security as of September 30, 2017
 
Fair value
 
Unrealized losses
 
Fair value
 
Unrealized losses
U.S. Treasury securities
 
$
6,242

 
$
(17
)
 
$
5

 
$
—

Other government-related debt securities:
 
 
 
 
 
 
 
 
U.S.
 
118

 
(1
)
 
12

 
—

Foreign and other
 
515

 
(2
)
 
65

 
(2
)
Corporate debt securities:
 
 
 
 
 
 
 
 
Financial
 
1,997

 
(6
)
 
151

 
(1
)
Industrial
 
2,434

 
(14
)
 
276

 
(3
)
Other
 
326

 
(2
)
 
26

 
—

Residential mortgage-backed securities
 
1,723

 
(8
)
 
94

 
(2
)
Other mortgage- and asset-backed securities
 
1,074

 
(4
)
 
38

 
—

Equity securities
 
13

 
(13
)
 
—

 
—

Total
 
$
14,442

 
$
(67
)
 
$
667

 
$
(8
)
 
 
Less than 12 months
 
12 months or more
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
)