Investments (Tables)

6 Months Ended

Jun. 30, 2018

Investment [Line Items]

Schedule of short-term investments and cash equivalents

		June 30,		December 31,
(In millions)		2018		2017
Corporate securities	$	1,663	$	1,143
Federal government securities	$	621	$	604
Foreign government securities	$	161	$	159
Money market funds	$	10	$	12

Realized gains and losses on investments

	Three Months Ended				Six Months Ended
	June 30,				June 30,
(In millions)	2018		2017		2018		2017
Fixed maturities	$	(26)	$	14	$	(46)	$	16
Equity securities		(7)		1		(26)		34
Commercial mortgage loans		-		(1)		-		(1)
Other investments, including derivatives		30		37		36		48
Realized investment (losses) gains before income taxes		(3)		51		(36)		97
Less income tax (benefit) expense		(1)		17		(11)		32
Net realized investment (losses) gains	$	(2)	$	34	$	(25)	$	65

Sales information for available-for-sale fixed maturities and equity securities

	Three Months Ended				Six Months Ended
	June 30,				June 30,
(In millions)	2018		2017		2018		2017
Proceeds from sales	$	774	$	516	$	1,273	$	930
Gross gains on sales	$	13	$	12	$	18	$	59
Gross losses on sales	$	(7)	$	(2)	$	(29)	$	(4)

Fixed Maturities [Member]

Investment [Line Items]

Investment maturities

		Amortized		Fair
(In millions)		Cost		Value
Due in one year or less	$	1,561	$	1,569
Due after one year through five years		6,678		6,760
Due after five years through ten years		10,430		10,242
Due after ten years		3,935		4,494
Mortgage and other asset-backed securities		519		528
Total fixed maturities	$	23,123	$	23,593

Gross unrealized appreciation (depreciation) on fixed maturities

				Gross		Gross
				Unrealized		Unrealized
		Amortized		Appre-		Depre-		Fair
(In millions)		Cost		ciation		ciation		Value
As of June 30, 2018
Federal government and agency	$	575	$	209	$	(4)	$	780
State and local government		978		69		(2)		1,045
Foreign government		2,354		120		(19)		2,455
Corporate		18,697		473		(385)		18,785
Mortgage and other asset-backed		519		19		(10)		528
Total fixed maturities	$	23,123	$	890	$	(420)	$	23,593
Investments supporting liabilities of the Company's run-off settlement annuity business (included in above total) (1)	$	2,282	$	525	$	(25)	$	2,782
As of December 31, 2017
Federal government and agency	$	541	$	239	$	(1)	$	779
State and local government		1,196		93		(2)		1,287
Foreign government		2,360		142		(15)		2,487
Corporate		17,301		868		(81)		18,088
Mortgage and other asset-backed		469		29		(1)		497
Total fixed maturities	$	21,867	$	1,371	$	(100)	$	23,138
Investments supporting liabilities of the Company's run-off settlement annuity business (included in above total) (1)	$	2,200	$	681	$	(2)	$	2,879
(1) Net unrealized appreciation for these investments is excluded from accumulated other comprehensive income.

Fixed maturities with a decline in fair value from amortized cost

	June 30, 2018							December 31, 2017
	Fair		Amortized		Unrealized		Number	Fair		Amortized		Unrealized		Number
(Dollars in millions)	Value		Cost		Depreciation		of Issues	Value		Cost		Depreciation		of Issues
One year or less
Investment grade	$	9,283	$	9,566	$	(283)	1,944	$	3,272	$	3,309	$	(37)	797
Below investment grade	$	1,285	$	1,318	$	(33)	1,157	$	543	$	553	$	(10)	643
More than one year
Investment grade	$	1,759	$	1,852	$	(93)	470	$	1,503	$	1,549	$	(46)	373
Below investment grade	$	147	$	158	$	(11)	55	$	155	$	162	$	(7)	42

Commercial Mortgage Loans [Member]

Investment [Line Items]

Credit risk profile of commercial mortgage loan portfolio

(Dollars in millions)	As of June 30, 2018				As of December 31, 2017
Loan-to-Value Ratio		Carrying Value	Average Debt Service Coverage Ratio	Average Loan-to-Value Ratio		Carrying Value	Average Debt Service Coverage Ratio	Average Loan-to-Value Ratio
Below 60%	$	1,195	2.02		$	1,109	2.03
60% to 79%		595	1.95			652	2.24
80% to 100%		76	1.49			-	-
Total	$	1,866	1.97	57%	$	1,761	2.11	57%