Investments (Tables)

6 Months Ended

Jun. 30, 2017

Investments [Abstract]

Net investment income

The significant components of Net investment income are presented in the following table.

Periods ended June 30	Three Months						Six Months
(In millions)	2017			2016			2017			2016
Fixed maturity securities	$	457		$	449		$	912		$	895
Equity securities	2			4			3			7
Limited partnership investments	16			46			106			32
Mortgage loans	8			13			15			22
Short term investments	3			1			6			4
Trading portfolio	4			4			6			6
Other	—			—			1			—
Gross investment income	490			517			1,049			966
Investment expense	(15		)	(15		)	(29		)	(29		)
Net investment income	$	475		$	502		$	1,020		$	937

Net realized investment gains (losses)

Net realized investment gains (losses) are presented in the following table.

Periods ended June 30	Three Months						Six Months
(In millions)	2017			2016			2017			2016
Net realized investment gains (losses):
Fixed maturity securities:
Gross realized gains	$	56		$	40		$	105		$	85
Gross realized losses	(12		)	(24		)	(29		)	(86		)
Net realized investment gains (losses) on fixed maturity securities	44			16			76			(1		)
Equity securities:
Gross realized gains	1			4			1			4
Gross realized losses	(1		)	(1		)	(1		)	(6		)
Net realized investment gains (losses) on equity securities	—			3			—			(2		)
Derivatives	(3		)	(6		)	(2		)	(13		)
Short term investments and other	9			3			12			(4		)
Net realized investment gains (losses)	$	50		$	16		$	86		$	(20	)

Components of net other than temporary impairment losses recognized in earnings by asset type

The components of Other-than-temporary impairment (OTTI) losses recognized in earnings by asset type are presented in the following table.

Periods ended June 30	Three Months				Six Months
(In millions)	2017		2016		2017		2016
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	2	$	13	$	4	$	29
Asset-backed:
Residential mortgage-backed	—		1		—		1
Other asset-backed	—		1		—		3
Total asset-backed	—		2		—		4
Total fixed maturity securities available-for-sale	2		15		4		33
Equity securities available-for-sale -- Common stock	—		—		—		5
OTTI losses recognized in earnings	$	2	$	15	$	4	$	38

Summary of fixed maturity and equity securities

The following tables present a summary of fixed maturity and equity securities.

June 30, 2017	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Unrealized OTTI Losses (Gains)
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	17,823	$	1,589	$	29	$	19,383	$	—
States, municipalities and political subdivisions	12,461		1,380		15		13,826		(13		)
Asset-backed:
Residential mortgage-backed	4,835		124		38		4,921		(27		)
Commercial mortgage-backed	1,907		59		14		1,952		—
Other asset-backed	1,050		16		5		1,061		—
Total asset-backed	7,792		199		57		7,934		(27		)
U.S. Treasury and obligations of government-sponsored enterprises	113		4		2		115		—
Foreign government	438		12		1		449		—
Redeemable preferred stock	18		1		—		19		—
Total fixed maturity securities available-for-sale	38,645		3,185		104		41,726		$	(40	)
Total fixed maturity securities trading	23						23
Equity securities available-for-sale:
Common stock	17		5		—		22
Preferred stock	91		6		1		96
Total equity securities available-for-sale	108		11		1		118
Total	$	38,776	$	3,196	$	105	$	41,867

December 31, 2016	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Unrealized OTTI Losses (Gains)
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	17,711	$	1,323	$	76	$	18,958	$	(1	)
States, municipalities and political subdivisions	12,060		1,213		33		13,240		(16		)
Asset-backed:
Residential mortgage-backed	5,004		120		51		5,073		(28		)
Commercial mortgage-backed	2,016		48		24		2,040		—
Other asset-backed	1,022		8		5		1,025		—
Total asset-backed	8,042		176		80		8,138		(28		)
U.S. Treasury and obligations of government-sponsored enterprises	83		10		—		93		—
Foreign government	435		13		3		445		—
Redeemable preferred stock	18		1		—		19		—
Total fixed maturity securities available-for-sale	38,349		2,736		192		40,893		$	(45	)
Total fixed maturity securities trading	12						12
Equity securities available-for-sale:
Common stock	13		6		—		19
Preferred stock	93		2		4		91
Total equity securities available-for-sale	106		8		4		110
Total	$	38,467	$	2,744	$	196	$	41,015

Securities in a gross unrealized loss position

The following tables present the estimated fair value and gross unrealized losses of fixed maturity and equity securities in a gross unrealized loss position by the length of time in which the securities have continuously been in that position.

	Less than 12 Months				12 Months or Longer				Total
June 30, 2017	Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	1,314	$	26	$	52	$	3	$	1,366	$	29
States, municipalities and political subdivisions	742		15		24		—		766		15
Asset-backed:
Residential mortgage-backed	1,722		34		141		4		1,863		38
Commercial mortgage-backed	473		8		125		6		598		14
Other asset-backed	159		4		14		1		173		5
Total asset-backed	2,354		46		280		11		2,634		57
U.S. Treasury and obligations of government-sponsored enterprises	65		2		—		—		65		2
Foreign government	109		1		—		—		109		1
Total fixed maturity securities available-for-sale	4,584		90		356		14		4,940		104
Equity securities available-for-sale:
Common stock	1		—		—		—		1		—
Preferred stock	15		1		—		—		15		1
Total equity securities available-for-sale	16		1		—		—		16		1
Total	$	4,600	$	91	$	356	$	14	$	4,956	$	105

	Less than 12 Months				12 Months or Longer				Total
December 31, 2016	Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses		Estimated Fair Value		Gross Unrealized Losses
(In millions)
Fixed maturity securities available-for-sale:
Corporate and other bonds	$	2,615	$	61	$	254	$	15	$	2,869	$	76
States, municipalities and political subdivisions	959		32		23		1		982		33
Asset-backed:
Residential mortgage-backed	2,136		44		201		7		2,337		51
Commercial mortgage-backed	756		22		69		2		825		24
Other asset-backed	398		5		24		—		422		5
Total asset-backed	3,290		71		294		9		3,584		80
U.S. Treasury and obligations of government-sponsored enterprises	5		—		—		—		5		—
Foreign government	108		3		—		—		108		3
Total fixed maturity securities available-for-sale	6,977		167		571		25		7,548		192
Equity securities available-for-sale -- Preferred stock	12		—		13		4		25		4
Total	$	6,989	$	167	$	584	$	29	$	7,573	$	196

Activity related to the pretax fixed maturity credit loss component reflected within retained earnings for securities still held for which a portion of an OTTI loss was recognized in OCI

The following table presents the activity related to the pretax credit loss component reflected in Retained earnings on fixed maturity securities still held as of June 30, 2017 and 2016 for which a portion of an OTTI loss was recognized in Other comprehensive income (loss).

Periods ended June 30	Three Months						Six Months
(In millions)	2017			2016			2017			2016
Beginning balance of credit losses on fixed maturity securities	$	32		$	48		$	36		$	53
Reductions for securities sold during the period	(2		)	(7		)	(6		)	(12		)
Ending balance of credit losses on fixed maturity securities	$	30		$	41		$	30		$	41

Contractual maturity

The following table presents available-for-sale fixed maturity securities by contractual maturity.

	June 30, 2017				December 31, 2016
(In millions)	Cost or Amortized Cost		Estimated Fair Value		Cost or Amortized Cost		Estimated Fair Value
Due in one year or less	$	1,590	$	1,628	$	1,779	$	1,828
Due after one year through five years	7,732		8,098		7,566		7,955
Due after five years through ten years	15,754		16,404		15,892		16,332
Due after ten years	13,569		15,596		13,112		14,778
Total	$	38,645	$	41,726	$	38,349	$	40,893