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Investments (Tables)
 3 Months Ended
Mar. 31, 2019
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 interest-bearing securities, which are considered available-for-sale, by type of security were as follows (in millions):
Types of securities as of March 31, 2019
 
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair
values
U.S. Treasury notes
 
$
2,709

 
$
—

 
$
(27
)
 
$
2,682

U.S. Treasury bills
 
3,475

 
—

 
—

 
3,475

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

 
—

 
(1
)
 
111

Foreign and other
 
964

 
4

 
(10
)
 
958

Corporate debt securities:
 
 
 
 
 
 
 
 
Financial
 
2,771

 
1

 
(22
)
 
2,750

Industrial
 
2,481

 
4

 
(27
)
 
2,458

Other
 
572

 
1

 
(7
)
 
566

Residential-mortgage-backed securities
 
1,404

 
—

 
(22
)
 
1,382

Other mortgage- and asset-backed securities
 
478

 
—

 
(11
)
 
467

Money market mutual funds
 
4,375

 
—

 
—

 
4,375

Other short-term interest-bearing securities
 
6,428

 
—

 
—

 
6,428

Total interest-bearing securities
 
$
25,769

 
$
10

 
$
(127
)
 
$
25,652

Types of securities as of December 31, 2018
 
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair
values
U.S. Treasury notes
 
$
2,710

 
$
—

 
$
(47
)
 
$
2,663

U.S. Treasury bills
 
8,191

 
—

 
—

 
8,191

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

 
—

 
(2
)
 
110

Foreign and other
 
972

 
1

 
(41
)
 
932

Corporate debt securities:
 
 
 
 
 
 
 
 
Financial
 
2,778

 
—

 
(81
)
 
2,697

Industrial
 
2,603

 
—

 
(99
)
 
2,504

Other
 
583

 
—

 
(21
)
 
562

Residential-mortgage-backed securities
 
1,458

 
—

 
(36
)
 
1,422

Other mortgage- and asset-backed securities
 
483

 
—

 
(14
)
 
469

Money market mutual funds
 
5,659

 
—

 
—

 
5,659

Other short-term interest-bearing securities
 
3,515

 
—

 
—

 
3,515

Total interest-bearing securities
 
$
29,064

 
$
1

 
$
(341
)
 
$
28,724
Fair values of available-for-sale investments by classification in the Consolidated Balance Sheets
The fair values of interest-bearing securities by location in the Condensed Consolidated Balance Sheets were as follows (in millions):
Condensed Consolidated Balance Sheets locations
 
March 31,
2019
 
December 31,
2018
Cash and cash equivalents
 
$
6,709

 
$
6,365

Marketable securities
 
18,943

 
22,359

Total interest-bearing securities
 
$
25,652

 
$
28,724
Fair values of available-for-sale interest-bearing security investments by contractual maturity
The fair values of interest-bearing securities 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
 
March 31,
2019
 
December 31,
2018
Maturing in one year or less
 
$
14,357

 
$
17,424

Maturing after one year through three years
 
4,600

 
3,356

Maturing after three years through five years
 
3,987

 
5,168

Maturing after five years through ten years
 
859

 
885

Mortgage- and asset-backed securities
 
1,849

 
1,891

Total interest-bearing securities
 
$
25,652

 
$
28,724
Available-for-sale securities, continuous unrealized loss position, fair value
The fair values and gross unrealized losses of interest-bearing securities 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 March 31, 2019
 
Fair values
 
Unrealized losses
 
Fair values
 
Unrealized losses
U.S. Treasury notes
 
$
1,190

 
$
(11
)
 
$
1,452

 
$
(16
)
Other government-related debt securities:
 
 
 
 
 
 
 
 
U.S.
 
—

 
—

 
111

 
(1
)
Foreign and other
 
410

 
(6
)
 
307

 
(4
)
Corporate debt securities:
 
 
 
 
 
 
 
 
Financial
 
1,783

 
(14
)
 
822

 
(8
)
Industrial
 
1,516

 
(20
)
 
634

 
(7
)
Other
 
454

 
(6
)
 
36

 
(1
)
Residential-mortgage-backed securities
 
558

 
(9
)
 
809

 
(13
)
Other mortgage- and asset-backed securities
 
17

 
—

 
450

 
(11
)
Total
 
$
5,928

 
$
(66
)
 
$
4,621

 
$
(61
)
 
 
Less than 12 months
 
12 months or more
Types of securities as of December 31, 2018
 
Fair values
 
Unrealized losses
 
Fair values
 
Unrealized losses
U.S. Treasury notes
 
$
1,219

 
$
(21
)
 
$
1,444

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

 
—

 
110

 
(2
)
Foreign and other
 
631

 
(31
)
 
240

 
(10
)
Corporate debt securities:
 
 
 
 
 
 
 
 
Financial
 
1,968

 
(59
)
 
718

 
(22
)
Industrial
 
1,898

 
(81
)
 
529

 
(18
)
Other
 
529

 
(20
)
 
28

 
(1
)
Residential-mortgage-backed securities
 
576

 
(14
)
 
840

 
(22
)
Other mortgage- and asset-backed securities
 
17

 
—

 
451

 
(14
)
Total
 
$
6,838

 
$
(226
)
 
$
4,360

 
$
(115
)