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Pension Plans, Retirement Benefits and Savings Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Retirement Benefits [Abstract]  
Summary of the funded status, obligations and amounts recognized in the consolidated balance sheet for the Company's benefit plans [Table Text Block]
The following tables summarize the funded status, obligations and amounts recognized in the consolidated balance sheet for the Company’s benefit plans. The Company uses a December 31 measurement date for its pension and postretirement benefit plans.
(at and for the year ended December 31,  in millions)
 
Qualified Domestic
Pension Plan
 
Nonqualified and Foreign
Pension Plans
 
Total
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Change in projected benefit obligation:
 
 
 
 
 
 
 
 
 
 
 
 
Benefit obligation at beginning of year
 
$
3,679

 
$
3,367

 
$
230

 
$
225

 
$
3,909

 
$
3,592

Benefits earned
 
126

 
112

 
7

 
7

 
133

 
119

Interest cost on benefit obligation
 
119

 
120

 
7

 
7

 
126

 
127

Actuarial (gain) loss
 
(273
)
 
258

 
(11
)
 
1

 
(284
)
 
259

Benefits paid
 
(207
)
 
(178
)
 
(12
)
 
(9
)
 
(219
)
 
(187
)
Settlement
 
—

 
—

 
—

 
(11
)
 
—

 
(11
)
Foreign currency exchange rate change
 
—

 
—

 
(6
)
 
10

 
(6
)
 
10

Benefit obligation at end of year
 
$
3,444

 
$
3,679

 
$
215

 
$
230

 
$
3,659

 
$
3,909

Change in plan assets:
 
 
 
 
 
 
 
 
 
 
 
 
Fair value of plan assets at beginning of year
 
$
3,957

 
$
3,387

 
$
113

 
$
106

 
$
4,070

 
$
3,493

Actual return on plan assets
 
(179
)
 
448

 
(1
)
 
11

 
(180
)
 
459

Company contributions
 
200

 
300

 
10

 
7

 
210

 
307

Benefits paid
 
(207
)
 
(178
)
 
(12
)
 
(9
)
 
(219
)
 
(187
)
Settlement
 
—

 
—

 
—

 
(12
)
 
—

 
(12
)
Foreign currency exchange rate change
 
—

 
—

 
(7
)
 
10

 
(7
)
 
10

Fair value of plan assets at end of year
 
3,771

 
3,957

 
103

 
113

 
3,874

 
4,070

Funded status of plan at end of year
 
$
327

 
$
278

 
$
(112
)
 
$
(117
)
 
$
215

 
$
161

Amounts recognized in the consolidated balance sheet consist of:
 
 
 
 
 
 
 
 
 
 
 
 
Accrued over-funded benefit plan assets
 
$
327

 
$
278

 
$
4

 
$
6

 
$
331

 
$
284

Accrued under-funded benefit plan liabilities
 
—

 
—

 
(116
)
 
(123
)
 
(116
)
 
(123
)
Total
 
$
327

 
$
278

 
$
(112
)
 
$
(117
)
 
$
215

 
$
161

Amounts recognized in accumulated other comprehensive income consist of:
 
 
 
 
 
 
 
 
 
 
 
 
Net actuarial loss
 
$
1,113

 
$
1,035

 
$
36

 
$
47

 
$
1,149

 
$
1,082

Prior service benefit
 
(5
)
 
(6
)
 
1

 
—

 
(4
)
 
(6
)
Total
 
$
1,108

 
$
1,029

 
$
37

 
$
47

 
$
1,145

 
$
1,076

 
 
Postretirement
Benefit Plans
(at and for the year ended December 31, in millions)
 
2018
 
2017
Change in projected benefit obligation:
 
 
 
 
Benefit obligation at beginning of year
 
$
225

 
$
214

Benefits earned
 
—

 
—

Interest cost on benefit obligation
 
7

 
7

Actuarial (gain) loss
 
(18
)
 
13

Benefits paid
 
(10
)
 
(10
)
Foreign currency exchange rate change
 
(1
)
 
1

Benefit obligation at end of year
 
$
203

 
$
225

Change in plan assets:
 
 
 
 
Fair value of plan assets at beginning of year
 
$
13

 
$
14

Actual return on plan assets
 
—

 
—

Company contributions
 
9

 
9

Benefits paid
 
(10
)
 
(10
)
Fair value of plan assets at end of year
 
12

 
13

Funded status of plan at end of year
 
$
(191
)
 
$
(212
)
Amounts recognized in the consolidated balance sheet consist of:
 
 
 
 
Accrued under-funded benefit plan liability
 
$
(191
)
 
$
(212
)
Amounts recognized in accumulated other comprehensive income consist of:
 
 
 
 
Net actuarial gain
 
$
(17
)
 
$
—

Prior service benefit
 
(25
)
 
(28
)
Total
 
$
(42
)
 
$
(28
)
Summary of the components of net periodic benefit cost and other amounts recognized in other comprehensive income related to the benefit plans [Table Text Block]
The following table summarizes the components of net periodic benefit cost and other amounts recognized in other comprehensive income related to the benefit plans.
 
 
Pension Plans
 
Postretirement Benefit
Plans
(for the year ended December 31, in millions)
 
2018
 
2017
 
2016
 
2018
 
2017
 
2016
Net Periodic Benefit Cost:
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
133

 
$
119

 
$
118

 
$
—

 
$
—

 
$
—

Non-service cost:
 
 
 
 
 
 
 
 
 
 
 
 
Interest cost on benefit obligation
 
126

 
127

 
122

 
7

 
7

 
8

Expected return on plan assets
 
(264
)
 
(240
)
 
(230
)
 
—

 
—

 
—

Settlement
 
—

 
3

 
1

 
—

 
—

 
—

Amortization of unrecognized:
 
 
 
 
 
 
 
 
 
 
 
 
Prior service benefit
 
(1
)
 
(1
)
 
(1
)
 
(4
)
 
(4
)
 
(3
)
Net actuarial loss
 
91

 
85

 
66

 
—

 
—

 
—

Total non-service cost (benefit)
 
(48
)
 
(26
)
 
(42
)
 
3

 
3

 
5

Net periodic benefit cost
 
85

 
93

 
76

 
3

 
3

 
5

Other Changes in Benefit Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income:
 
 
 
 
 
 
 
 
 
 
 
 
Prior service benefit
 
—

 
—

 
—

 
—

 
—

 
—

Net actuarial loss (gain)
 
160

 
40

 
66

 
(18
)
 
13

 
(17
)
Foreign currency exchange rate change
 
(1
)
 
2

 
(2
)
 
—

 
(1
)
 
1

Settlement
 
—

 
(2
)
 
(1
)
 
—

 
—

 
—

Amortization of prior service benefit
 
1

 
1

 
1

 
4

 
4

 
3

Amortization of net actuarial loss
 
(91
)
 
(85
)
 
(66
)
 
—

 
—

 
—

Total other changes recognized in other comprehensive income
 
69

 
(44
)
 
(2
)
 
(14
)
 
16

 
(13
)
Total other changes recognized in net periodic benefit cost and other comprehensive income
 
$
154

 
$
49

 
$
74

 
$
(11
)
 
$
19

 
$
(8
)
Consolidated statement of income line items impacted by service costs and non-service benefit costs [Table Text Block]
The following table indicates the line items in which the respective service costs and non-service costs are presented in the consolidated statement of income for the years ended December 31, 2018, 2017 and 2016.
 
 
Pension Plans
 
Postretirement Benefit
Plans
(for the year ended December 31, in millions)
 
2018
 
2017
 
2016
 
2018
 
2017
 
2016
Service Cost:
 
 
 
 
 
 
 
 
 
 
 
 
Net investment income
 
$
1

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Claims and claim adjustment expenses
 
54

 
48

 
48

 
—

 
$
—

 
—

General and administrative expenses
 
78

 
71

 
70

 
—

 
—

 
—

Total service cost
 
133

 
119

 
118

 
—

 
—

 
—

 
 
 
 
 
 
 
 
 
 
 
 
 
Non-Service Cost:
 
 
 
 
 
 
 
 
 
 
 
 
Claims and claim adjustment expenses
 
(19
)
 
(11
)
 
(18
)
 
1

 
1

 
2

General and administrative expenses
 
(29
)
 
(15
)
 
(24
)
 
2

 
2

 
3

Total non-service cost (benefit)
 
(48
)
 
(26
)
 
(42
)
 
3

 
3


5

Net periodic benefit cost
 
$
85

 
$
93

 
$
76

 
$
3

 
$
3


$
5
Benefit obligations assumptions, net periodic benefit cost assumptions and health care cost trend rates [Table Text Block]
The following table summarizes assumptions used with regard to the Company’s qualified and nonqualified domestic pension plans and the domestic postretirement benefit plans.
(at and for the year ended December 31,)
 
2018
 
2017
Assumptions used to determine benefit obligations
 
 
 
 
Discount rate:
 
 
 
 
Qualified domestic pension plan
 
4.39
%
 
3.71
%
Nonqualified domestic pension plan
 
4.33
%
 
3.66
%
Domestic postretirement benefit plan
 
4.26
%
 
3.60
%
Cash balance interest crediting rate
 
4.01
%
 
4.01
%
Future compensation increase rate
 
4.00
%
 
4.00
%
Assumptions used to determine net periodic benefit cost
 
 
 
 
Discount rate:
 
 
 
 
Qualified domestic pension plan:
 
 
 
 
Service cost
 
3.87
%
 
4.52
%
Interest cost
 
3.34
%
 
3.55
%
Nonqualified domestic pension plan:
 
 
 
 
Service cost
 
3.73
%
 
4.24
%
Interest cost
 
3.26
%
 
3.43
%
Domestic postretirement benefit plan:
 
 
 
 
Interest cost
 
3.21
%
 
3.42
%
Expected long-term rate of return on assets:
 
 
 
 
Pension plan
 
7.00
%
 
7.00
%
Postretirement benefit plan
 
4.00
%
 
4.00
%
Assumed health care cost trend rates
 
 
 
 
Following year:
 
 
 
 
Medical (before age 65)
 
7.50
%
 
7.50
%
Medical (age 65 and older)
 
8.75
%
 
8.75
%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)
 
4.50
%
 
4.50
%
Year that the rate reaches the ultimate trend rate:
 
 
 
 
Medical (before age 65)
 
2026

 
2026

Medical (age 65 and older)
 
2026

 
2026
Level within the fair value hierarchy at which the financial assets of the Company's pension plans are measured [Table Text Block]
The following tables present the level within the fair value hierarchy at which the financial assets of the Company’s pension plans are measured on a recurring basis.
(at December 31, 2018, in millions)
 
Total
 
Level 1
 
Level 2
 
Level 3
Invested assets:
 
 
 
 
 
 
 
 
Fixed maturities
 
 
 
 
 
 
 
 
Obligations of states, municipalities and political subdivisions
 
$
3

 
$
—

 
$
3

 
$
—

Debt securities issued by foreign governments
 
27

 
—

 
27

 
—

Mortgage-backed securities, collateralized mortgage obligations and pass-through securities
 
30

 
—

 
30

 
—

All other corporate bonds
 
712

 
—

 
712

 
—

Total fixed maturities
 
772

 
—

 
772

 
—

Mutual funds
 
 
 
 
 
 
 
 
Equity mutual funds
 
1,288

 
1,282

 
6

 
—

Bond mutual funds
 
760

 
757

 
3

 
—

Total mutual funds
 
2,048

 
2,039

 
9

 
—

Equity securities
 
783

 
783

 
—

 
—

Other investments
 
1

 
—

 
—

 
1

Cash and short-term securities
 
 
 
 
 
 
 
 
U.S. Treasury securities
 
30

 
30

 
—

 
—

Other
 
240

 
19

 
221

 
—

Total cash and short-term securities
 
270

 
49

 
221

 
—

Total
 
$
3,874

 
$
2,871

 
$
1,002

 
$
1



(at December 31, 2017, in millions)
 
Total
 
Level 1
 
Level 2
 
Level 3
Invested assets:
 
 
 
 
 
 
 
 
Fixed maturities
 
 
 
 
 
 
 
 
Obligations of states, municipalities and political subdivisions
 
$
3

 
$
—

 
$
3

 
$
—

Debt securities issued by foreign governments
 
16

 
—

 
16

 
—

Mortgage-backed securities, collateralized mortgage obligations and pass-through securities
 
10

 
—

 
10

 
—

All other corporate bonds
 
514

 
—

 
514

 
—

Total fixed maturities
 
543

 
—

 
543

 
—

Mutual funds
 
 
 
 
 
 
 
 
Equity mutual funds
 
1,335

 
1,328

 
7

 
—

Bond mutual funds
 
822

 
819

 
3

 
—

Total mutual funds
 
2,157

 
2,147

 
10

 
—

Equity securities
 
883

 
882

 
1

 
—

Other investments
 
1

 
—

 
—

 
1

Cash and short-term securities
 
 
 
 
 
 
 
 
U.S. Treasury securities
 
241

 
241

 
—

 
—

Money market mutual funds
 
27

 
27

 
—

 
—

Other
 
218

 
27

 
191

 
—

Total cash and short-term securities
 
486

 
295

 
191

 
—

Total
 
$
4,070

 
$
3,324

 
$
745

 
$
1
Estimated future benefit payments [Table Text Block]
The following table presents the estimated benefits expected to be paid by the Company’s pension and postretirement benefit plans for the next ten years (reflecting estimated future employee service).
 
 
Benefits Expected to be Paid
(in millions)
 
Pension Plans
 
Postretirement Benefit Plans
2019
 
$
239

 
$
13

2020
 
246

 
14

2021
 
255

 
15

2022
 
260

 
15

2023
 
268

 
15

2024 through 2028
 
1,361

 
72