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Investments (Tables)
 3 Months Ended
Mar. 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
March 31, 2018
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
2,939

 
$
1

 
$
(54
)
 
$
2,886

State and municipal obligations
 
7,190

 
43

 
(94
)
 
7,139

Corporate obligations
 
14,411

 
15

 
(167
)
 
14,259

U.S. agency mortgage-backed securities
 
4,423

 
3

 
(110
)
 
4,316

Non-U.S. agency mortgage-backed securities
 
1,162

 
—

 
(20
)
 
1,142

Total debt securities - available-for-sale
 
30,125

 
62

 
(445
)
 
29,742

Debt securities - held-to-maturity:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
249

 
1

 
(2
)
 
248

State and municipal obligations
 
2

 
—

 
—

 
2

Corporate obligations
 
340

 
—

 
—

 
340

Total debt securities - held-to-maturity
 
591

 
1

 
(2
)
 
590

Total debt securities
 
$
30,716

 
$
63

 
$
(447
)
 
$
30,332

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 March 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
 
$
3,923

 
$
3,915

 
$
135

 
$
135

Due after one year through five years
 
11,400

 
11,273

 
202

 
200

Due after five years through ten years
 
6,874

 
6,766

 
103

 
103

Due after ten years
 
2,343

 
2,330

 
151

 
152

U.S. agency mortgage-backed securities
 
4,423

 
4,316

 
—

 
—

Non-U.S. agency mortgage-backed securities
 
1,162

 
1,142

 
—

 
—

Total debt securities
 
$
30,125

 
$
29,742

 
$
591

 
$
590
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 debt securities with gross unrealized losses by 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
March 31, 2018
 
 
 
 
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
1,787

 
$
(25
)
 
$
945

 
$
(29
)
 
$
2,732

 
$
(54
)
State and municipal obligations
 
3,958

 
(66
)
 
781

 
(28
)
 
4,739

 
(94
)
Corporate obligations
 
9,998

 
(129
)
 
1,193

 
(38
)
 
11,191

 
(167
)
U.S. agency mortgage-backed securities
 
2,775

 
(61
)
 
1,127

 
(49
)
 
3,902

 
(110
)
Non-U.S. agency mortgage-backed securities
 
863

 
(15
)
 
136

 
(5
)
 
999

 
(20
)
Total debt securities - available-for-sale
 
$
19,381

 
$
(296
)
 
$
4,182

 
$
(149
)
 
$
23,563

 
$
(445
)
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
)