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Investments (Tables)
 3 Months Ended
Mar. 31, 2019
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, 2019
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
3,610

 
$
30

 
$
(19
)
 
$
3,621

State and municipal obligations
 
6,566

 
150

 
(9
)
 
6,707

Corporate obligations
 
15,589

 
95

 
(58
)
 
15,626

U.S. agency mortgage-backed securities
 
5,212

 
37

 
(51
)
 
5,198

Non-U.S. agency mortgage-backed securities
 
1,471

 
13

 
(6
)
 
1,478

Total debt securities - available-for-sale
 
32,448

 
325

 
(143
)
 
32,630

Debt securities - held-to-maturity:
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
265

 
—

 
(1
)
 
264

State and municipal obligations
 
31

 
1

 
—

 
32

Corporate obligations
 
428

 
1

 
—

 
429

Total debt securities - held-to-maturity
 
724

 
2

 
(1
)
 
725

Total debt securities
 
$
33,172

 
$
327

 
$
(144
)
 
$
33,355

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
Investments by Contractual Maturity [Table Text Block]
The amortized cost and fair value of debt securities as of March 31, 2019, 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
 
$
3,457

 
$
3,455

 
$
132

 
$
132

Due after one year through five years
 
12,283

 
12,304

 
318

 
318

Due after five years through ten years
 
7,314

 
7,430

 
131

 
131

Due after ten years
 
2,711

 
2,765

 
143

 
144

U.S. agency mortgage-backed securities
 
5,212

 
5,198

 
—

 
—

Non-U.S. agency mortgage-backed securities
 
1,471

 
1,478

 
—

 
—

Total debt securities
 
$
32,448

 
$
32,630

 
$
724

 
$
725
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, 2019
 
 
 
 
 
 
 
 
 
 
 
 
Debt securities - available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agency obligations
 
$
—

 
$
—

 
$
1,329

 
$
(19
)
 
$
1,329

 
$
(19
)
State and municipal obligations
 
—

 
—

 
1,274

 
(9
)
 
1,274

 
(9
)
Corporate obligations
 
1,461

 
(7
)
 
5,479

 
(51
)
 
6,940

 
(58
)
U.S. agency mortgage-backed securities
 
—

 
—

 
2,979

 
(51
)
 
2,979

 
(51
)
Non-U.S. agency mortgage-backed securities
 
—

 
—

 
546

 
(6
)
 
546

 
(6
)
Total debt securities - available-for-sale
 
$
1,461

 
$
(7
)
 
$
11,607

 
$
(136
)
 
$
13,068

 
$
(143
)
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
)