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Investments (Tables)
 9 Months Ended
Sep. 30, 2018
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):
Types of securities as of September 30, 2018
 
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair
values
U.S. Treasury notes
 
$
2,710

 
$
—

 
$
(84
)
 
$
2,626

U.S. Treasury bills
 
5,376

 
—

 
—

 
5,376

Other government-related debt securities:
 
 
 
 
 
 
 
 
U.S.
 
112

 
—

 
(3
)
 
109

Foreign and other
 
1,048

 
1

 
(41
)
 
1,008

Corporate debt securities:
 
 
 
 
 
 
 
 
Financial
 
2,786

 
—

 
(89
)
 
2,697

Industrial
 
2,654

 
4

 
(80
)
 
2,578

Other
 
594

 
—

 
(21
)
 
573

Residential-mortgage-backed securities
 
1,524

 
—

 
(62
)
 
1,462

Other mortgage- and asset-backed securities
 
490

 
—

 
(17
)
 
473

Money market mutual funds
 
8,955

 
—

 
—

 
8,955

Other short-term interest-bearing securities
 
3,561

 
—

 
—

 
3,561

Total available-for-sale investments
 
$
29,810

 
$
5

 
$
(397
)
 
$
29,418

Types of securities as of December 31, 2017
 
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair
values
U.S. Treasury notes
 
$
8,313

 
$
1

 
$
(72
)
 
$
8,242

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

 
—

 
(2
)
 
223

Foreign and other
 
2,415

 
18

 
(11
)
 
2,422

Corporate debt securities:
 
 
 
 
 
 
 
 
Financial
 
10,089

 
17

 
(34
)
 
10,072

Industrial
 
9,688

 
34

 
(52
)
 
9,670

Other
 
1,393

 
3

 
(6
)
 
1,390

Residential-mortgage-backed securities
 
2,198

 
—

 
(30
)
 
2,168

Other mortgage- and asset-backed securities
 
2,312

 
—

 
(15
)
 
2,297

Money market mutual funds
 
3,245

 
—

 
—

 
3,245

Other short-term interest-bearing securities
 
1,440

 
—

 
—

 
1,440

Total interest-bearing securities
 
41,318

 
73

 
(222
)
 
41,169

Equity securities
 
135

 
14

 
—

 
149

Total available-for-sale investments
 
$
41,453

 
$
87

 
$
(222
)
 
$
41,318
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):
Types of securities as of September 30, 2018
 
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair
values
U.S. Treasury notes
 
$
2,710

 
$
—

 
$
(84
)
 
$
2,626

U.S. Treasury bills
 
5,376

 
—

 
—

 
5,376

Other government-related debt securities:
 
 
 
 
 
 
 
 
U.S.
 
112

 
—

 
(3
)
 
109

Foreign and other
 
1,048

 
1

 
(41
)
 
1,008

Corporate debt securities:
 
 
 
 
 
 
 
 
Financial
 
2,786

 
—

 
(89
)
 
2,697

Industrial
 
2,654

 
4

 
(80
)
 
2,578

Other
 
594

 
—

 
(21
)
 
573

Residential-mortgage-backed securities
 
1,524

 
—

 
(62
)
 
1,462

Other mortgage- and asset-backed securities
 
490

 
—

 
(17
)
 
473

Money market mutual funds
 
8,955

 
—

 
—

 
8,955

Other short-term interest-bearing securities
 
3,561

 
—

 
—

 
3,561

Total available-for-sale investments
 
$
29,810

 
$
5

 
$
(397
)
 
$
29,418

Types of securities as of December 31, 2017
 
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair
values
U.S. Treasury notes
 
$
8,313

 
$
1

 
$
(72
)
 
$
8,242

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

 
—

 
(2
)
 
223

Foreign and other
 
2,415

 
18

 
(11
)
 
2,422

Corporate debt securities:
 
 
 
 
 
 
 
 
Financial
 
10,089

 
17

 
(34
)
 
10,072

Industrial
 
9,688

 
34

 
(52
)
 
9,670

Other
 
1,393

 
3

 
(6
)
 
1,390

Residential-mortgage-backed securities
 
2,198

 
—

 
(30
)
 
2,168

Other mortgage- and asset-backed securities
 
2,312

 
—

 
(15
)
 
2,297

Money market mutual funds
 
3,245

 
—

 
—

 
3,245

Other short-term interest-bearing securities
 
1,440

 
—

 
—

 
1,440

Total interest-bearing securities
 
41,318

 
73

 
(222
)
 
41,169

Equity securities
 
135

 
14

 
—

 
149

Total available-for-sale investments
 
$
41,453

 
$
87

 
$
(222
)
 
$
41,318
Fair values of available-for-sale investments by classification in the Consolidated Balance Sheets
The fair values of available-for-sale investments by location in the Condensed Consolidated Balance Sheets were as follows (in millions):
Condensed Consolidated Balance Sheets locations
 
September 30,
2018
 
December 31,
2017
Cash and cash equivalents
 
$
11,453

 
$
3,291

Marketable securities
 
17,965

 
37,878

Other assets
 
—

 
149

Total available-for-sale investments
 
$
29,418

 
$
41,318
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 maturities
 
September 30,
2018
 
December 31,
2017
Maturing in one year or less
 
$
17,943

 
$
6,733

Maturing after one year through three years
 
2,947

 
12,820

Maturing after three years through five years
 
5,585

 
13,836

Maturing after five years through ten years
 
1,008

 
3,263

Maturing after ten years
 
—

 
52

Mortgage- and asset-backed securities
 
1,935

 
4,465

Total interest-bearing securities
 
$
29,418

 
$
41,169
Available-for-sale securities, continuous unrealized loss position, fair value
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 were as follows (in millions):
 
 
Less than 12 months
 
12 months or more
Types of securities as of September 30, 2018
 
Fair values
 
Unrealized losses
 
Fair values
 
Unrealized losses
U.S. Treasury notes
 
$
1,795

 
$
(58
)
 
$
831

 
$
(26
)
Other government-related debt securities:
 
 
 
 
 
 
 
 
U.S.
 
43

 
(1
)
 
66

 
(2
)
Foreign and other
 
855

 
(38
)
 
74

 
(3
)
Corporate debt securities:
 
 
 
 
 
 
 
 
Financial
 
2,262

 
(74
)
 
397

 
(15
)
Industrial
 
1,970

 
(68
)
 
318

 
(12
)
Other
 
533

 
(21
)
 
13

 
—

Residential-mortgage-backed securities
 
673

 
(27
)
 
782

 
(35
)
Other mortgage- and asset-backed securities
 
135

 
(4
)
 
337

 
(13
)
Total
 
$
8,266

 
$
(291
)
 
$
2,818

 
$
(106
)
 
 
Less than 12 months
 
12 months or more
Types of securities as of December 31, 2017
 
Fair values
 
Unrealized losses
 
Fair values
 
Unrealized losses
U.S. Treasury notes
 
$
7,728

 
$
(70
)
 
$
195

 
$
(2
)
Other government-related debt securities:
 
 
 
 
 
 
 
 
U.S.
 
188

 
(1
)
 
34

 
(1
)
Foreign and other
 
1,163

 
(9
)
 
115

 
(2
)
Corporate debt securities:
 
 
 
 
 
 
 
 
Financial
 
5,928

 
(28
)
 
462

 
(6
)
Industrial
 
5,760

 
(43
)
 
612

 
(9
)
Other
 
868

 
(4
)
 
117

 
(2
)
Residential-mortgage-backed securities
 
1,838

 
(24
)
 
276

 
(6
)
Other mortgage- and asset-backed securities
 
1,777

 
(12
)
 
250

 
(3
)
Total
 
$
25,250

 
$
(191
)
 
$
2,061

 
$
(31
)