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Investments (Tables)
 12 Months Ended
Dec. 31, 2018
Short-Term and Long-Term Investments [Table Text Block]
A summary of debt securities by major security type is as follows:
(in millions)
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
December 31, 2018
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
3,434

 
$
13

 
$
(42
)
 
$
3,405

State and municipal obligations
 
7,117

 
61

 
(57
)
 
7,121

Corporate obligations
 
15,366

 
14

 
(218
)
 
15,162

U.S. agency mortgage-backed securities
 
4,947

 
11

 
(106
)
 
4,852

Non-U.S. agency mortgage-backed securities
 
1,376

 
2

 
(20
)
 
1,358

Total debt securities - available-for-sale
 
32,240

 
101

 
(443
)
 
31,898

Debt securities - held-to-maturity:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
255

 
1

 
(2
)
 
254

State and municipal obligations
 
11

 
—

 
—

 
11

Corporate obligations
 
355

 
—

 
—

 
355

Total debt securities - held-to-maturity
 
621

 
1

 
(2
)
 
620

Total debt securities
 
$
32,861

 
$
102

 
$
(445
)
 
$
32,518

December 31, 2017
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
2,673

 
$
1

 
$
(30
)
 
$
2,644

State and municipal obligations
 
7,596

 
99

 
(35
)
 
7,660

Corporate obligations
 
13,181

 
57

 
(44
)
 
13,194

U.S. agency mortgage-backed securities
 
3,942

 
7

 
(38
)
 
3,911

Non-U.S. agency mortgage-backed securities
 
1,018

 
3

 
(6
)
 
1,015

Total debt securities - available-for-sale
 
28,410

 
167

 
(153
)
 
28,424

Debt securities - held-to-maturity:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
254

 
1

 
(1
)
 
254

State and municipal obligations
 
2

 
—

 
—

 
2

Corporate obligations
 
280

 
—

 
—

 
280

Total debt securities - held-to-maturity
 
536

 
1

 
(1
)
 
536

Total debt securities
 
$
28,946

 
$
168

 
$
(154
)
 
$
28,960
Investments by Contractual Maturity [Table Text Block]
The amortized cost and fair value of debt securities as of December 31, 2018, by contractual maturity, were as follows:
 
 
Available-for-Sale
 
Held-to-Maturity
(in millions)
 
Amortized
Cost
 
Fair
Value
 
Amortized
Cost
 
Fair
Value
Due in one year or less
 
$
3,560

 
$
3,551

 
$
150

 
$
150

Due after one year through five years
 
12,432

 
12,297

 
213

 
212

Due after five years through ten years
 
7,362

 
7,270

 
129

 
129

Due after ten years
 
2,563

 
2,570

 
129

 
129

U.S. agency mortgage-backed securities
 
4,947

 
4,852

 
—

 
—

Non-U.S. agency mortgage-backed securities
 
1,376

 
1,358

 
—

 
—

Total debt securities
 
$
32,240

 
$
31,898

 
$
621

 
$
620
Fair Value of Available-for-Sale Investments with Gross Unrealized Losses by Investment Type and Length of Time that Individual Securities have been in a Continuous Unrealized Loss Position [Table Text Block]
The fair value of available-for-sale investments with gross unrealized losses by major security type and length of time that individual securities have been in a continuous unrealized loss position were as follows:
 
 
Less Than 12 Months
 
12 Months or Greater
 
 Total
(in millions)
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
December 31, 2018
 
 
 
 
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
998

 
$
(7
)
 
$
1,425

 
$
(35
)
 
$
2,423

 
$
(42
)
State and municipal obligations
 
1,334

 
(11
)
 
2,491

 
(46
)
 
3,825

 
(57
)
Corporate obligations
 
8,105

 
(109
)
 
4,239

 
(109
)
 
12,344

 
(218
)
U.S. agency mortgage-backed securities
 
1,296

 
(22
)
 
2,388

 
(84
)
 
3,684

 
(106
)
Non-U.S. agency mortgage-backed securities
 
622

 
(7
)
 
459

 
(13
)
 
1,081

 
(20
)
Total debt securities - available-for-sale
 
$
12,355

 
$
(156
)
 
$
11,002

 
$
(287
)
 
$
23,357

 
$
(443
)
December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
1,249

 
$
(8
)
 
$
1,027

 
$
(22
)
 
$
2,276

 
$
(30
)
State and municipal obligations
 
2,599

 
(21
)
 
866

 
(14
)
 
3,465

 
(35
)
Corporate obligations
 
5,901

 
(23
)
 
1,242

 
(21
)
 
7,143

 
(44
)
U.S. agency mortgage-backed securities
 
1,657

 
(12
)
 
1,162

 
(26
)
 
2,819

 
(38
)
Non-U.S. agency mortgage-backed securities
 
411

 
(3
)
 
144

 
(3
)
 
555

 
(6
)
Total debt securities - available-for-sale
 
$
11,817

 
$
(67
)
 
$
4,441

 
$
(86
)
 
$
16,258

 
$
(153
)