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Short-term Investments (Tables)
 12 Months Ended
Dec. 31, 2016
Investments [Abstract]  
Schedule of short-term investments
Our short-term investments were as follows as of December 31:
 
2016
 
2015
 
(in millions)
Trading investment securities:
 
 
 
Mutual funds
$
25

 
$
—

Total trading investment securities
25

 
—

Available-for-sale investment securities:
 
 
 
U.S. Treasury and agency debt securities
602

 
527

Corporate and other debt securities
405

 
361

Certificates of deposit and commercial paper
911

 
754

Asset-backed securities
231

 
230

Municipal debt securities
115

 
121

Mutual funds
—

 
22

Total available-for-sale investment securities
2,264

 
2,015

Held-to-maturity investment securities:
 
 
 
Certificates of deposit and commercial paper
40

 
—

Total held-to-maturity investment securities
40

 
—

Other investments:
 
 
 
Time deposits
806

 
809

Total other investments
806

 
809

Total short-term investments
$
3,135

 
$
2,824
Amortized Cost, Gross Unrealized Gains And Losses And Fair Value Of Investment Securities Available-For-Sale
The amortized cost, gross unrealized gains and losses and fair value of our available-for-sale investment securities were as follows at December 31:
 
2016
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
 
(in millions)
U.S. Treasury and agency debt securities
$
605

 
$
—

 
$
(3
)
 
$
602

Corporate and other debt securities
407

 
—

 
(2
)
 
405

Certificates of deposit and commercial paper
910

 
1

 
—

 
911

Asset-backed securities
232

 
—

 
(1
)
 
231

Municipal debt securities
116

 
—

 
(1
)
 
115

Total available-for-sale investment securities
$
2,270

 
$
1

 
$
(7
)
 
$
2,264


 
2015
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
 
(in millions)
U.S. Treasury and agency debt securities
$
529

 
$
—

 
$
(2
)
 
$
527

Corporate and other debt securities
362

 
1

 
(2
)
 
361

Certificates of deposit and commercial paper
754

 
—

 
—

 
754

Asset-backed securities
231

 
—

 
(1
)
 
230

Municipal debt securities
121

 
—

 
—

 
121

Mutual funds
25

 
—

 
(3
)
 
22

Total available-for-sale investment securities
$
2,022

 
$
1

 
$
(8
)
 
$
2,015
Available-For-Sale Securities In A Continuous Unrealized Loss Position
The fair value and related unrealized losses of our available-for-sale investment securities in a continuous unrealized loss position for less than 12 months and for 12 months or longer were as follows as of December 31:
 
2016
 
Less than 12 Months
 
12 Months or More
 
Total
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
(in millions)
U.S. Treasury and agency debt securities
$
526

 
$
(3
)
 
$
—

 
$
—

 
$
526

 
$
(3
)
Corporate and other debt securities
342

 
(2
)
 
1

 
—

 
343

 
(2
)
Certificates of deposit and commercial paper
185

 
—

 
—

 
—

 
185

 
—

Asset-backed securities
206

 
(1
)
 
1

 
—

 
207

 
(1
)
Municipal debt securities
88

 
(1
)
 
1

 
—

 
89

 
(1
)
Total
$
1,347

 
$
(7
)
 
$
3

 
$
—

 
$
1,350

 
$
(7
)

 
2015
 
Less than 12 Months
 
12 Months or More
 
Total
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
(in millions)
U.S. Treasury and agency debt securities
$
476

 
$
(2
)
 
$
—

 
$
—

 
$
476

 
$
(2
)
Corporate and other debt securities
315

 
(2
)
 
3

 
—

 
318

 
(2
)
Certificates of deposit and commercial paper
272

 
—

 
—

 
—

 
272

 
—

Asset-backed securities
199

 
(1
)
 
12

 
—

 
211

 
(1
)
Municipal debt securities
56

 
—

 
—

 
—

 
56

 
—

Mutual funds
—

 
—

 
21

 
(3
)
 
21

 
(3
)
Total
$
1,318

 
$
(5
)
 
$
36

 
$
(3
)
 
$
1,354

 
$
(8
)
Contractual Maturities Of Investments In Debt Securities Available-For-Sale
The contractual maturities of our fixed income available-for-sale investment securities as of December 31, 2016 are set forth in the following table:
 
Amortized
Cost
 
Fair
Value
 
(in millions)
Due within one year
$
1,061

 
$
1,061

Due after one year up to two years
482

 
480

Due after two years up to three years
362

 
360

Due after three years
133

 
132

Asset-backed securities
232

 
231

Total available-for-sale investment securities
$
2,270

 
$
2,264
Gross Gains (Losses) Realized On Sales, Maturities And Other Securities Transactions Related To Investment Securities
Proceeds from sales of available-for-sale investment securities and the gross gains and losses that have been included in earnings as a result of those sales were as follows:
 
 
2016
 
2015
 
2014
 
 
(in millions)
Proceeds from sales of available-for-sale investment securities
 
$
3,541

 
$
782

 
$
1,476

 
 
 
 
 
 
 
Gross gains
 
$
5

 
$
1

 
$
2

Gross losses
 
(4
)
 
—

 
—

Net realized gains on sales of available-for-sale investment securities
 
$
1

 
$
1

 
$
2
Held-to-maturity Securities
The amortized cost, gross unrealized gains and losses and fair value of held-to-maturity investment securities at December 31, 2016 were as follows:
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
 
(in millions)
Certificates of deposit and commercial paper
40

 
—

 
—

 
40

Total held-to-maturity investment securities
$
40

 
$
—

 
$
—

 
$
40