Pension and Other Postretirement Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2017

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Projected benefit obligations and assets

		Pension				Other Postretirement
		Benefits				Benefits
(In millions)	2017		2016		2017		2016
Change in benefit obligation
Benefit obligation, January 1	$	4,888	$	4,934	$	277	$	295
Service cost		3		2		-		-
Interest cost		186		199		9		11
Loss from past experience		181	(1)	57	(1)	1		2
Benefits paid from plan assets		(277)		(284)		(3)		(3)
Benefits paid — other		(12)		(20)		(26)		(28)
Benefit obligation, December 31		4,969		4,888		258		277
Change in plan assets
Fair value of plan assets, January 1		3,977		3,981		5		8
Actual return on plan assets		418		279		-		-
Benefits paid		(277)		(284)		(3)		(3)
Contributions		163		1		-		-
Fair value of plan assets, December 31		4,281		3,977		2		5
Funded status	$	(688)	$	(911)	$	(256)	$	(272)
(1) Loss in each year reflects a decrease in the discount rate, partially offset by a favorable change in the mortality assumption.

Expected benefit payments

	Pension		Other Postretirement
(In millions)	Benefits		Benefits
2018	$	340	$	27
2019	$	334	$	26
2020	$	325	$	25
2021	$	325	$	23
2022	$	324	$	22
2023-2027	$	1,573	$	87

Postretirement benefits liability adjustment included in AOCI

	Pension				Other
	Benefits				Postretirement Benefits
(In millions)	2017		2016		2017		2016
Unrecognized net (losses)	$	(2,113)	$	(2,163)	$	-	$	-
Unrecognized prior service cost		(6)		(6)		46		49
Postretirement benefits liability adjustment	$	(2,119)	$	(2,169)	$	46	$	49

Components of net defined benefit plan costs

	Pension Benefits						Other Postretirement Benefits
(In millions)	2017		2016		2015		2017		2016		2015
Service cost	$	3	$	2	$	2	$	-	$	-	$	-
Interest cost		186		199		194		9		11		11
Expected long-term return on plan assets		(260)		(249)		(267)		-		-		-
Amortization of:
Net loss from past experience		66		65		70		1		1		-
Prior service cost		-		1		-		(3)		(3)		(3)
Settlement loss		7		-		-		-		-		-
Net plan cost	$	2	$	18	$	(1)	$	7	$	9	$	8

Assumptions for pension and other postretirement benefit plans

	2017	2016
Discount rate:
Pension benefit obligation	3.51%	3.95%
Other postretirement benefit obligation	3.37%	3.70%
Pension benefit cost	3.95%	4.17%
Other postretirement benefit cost	3.70%	3.89%
Expected long-term return on plan assets:
Pension benefit cost	7.25%	7.25%
Other postretirement benefit cost	5.00%	5.00%
Mortality table for pension and postretirement benefit obligations	RP 2014 with MP 2017 projection scale	RP 2014 with MP 2016 projection scale

Annual expense for 401(k) plans

(In millions)	2017		2016		2015
Expense	$	122	$	113	$	106

Pension Benefits [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Fair value of pension plan assets

(In millions)		2017		2016
Fixed maturities:
Federal government and agency	$	1	$	1
Corporate		1,124		1,125
Asset-backed		22		22
Fund investments		884		630
Total fixed maturities		2,031		1,778
Equity securities:
Domestic		689		681
International, including funds and pooled separate accounts (1)		476		350
Total equity securities		1,165		1,031
Securities partnerships		457		424
Real estate funds, including pooled separate accounts (1)		300		289
Commercial mortgage loans		140		129
Hedge funds		73		196
Guaranteed deposit account contract		63		67
Cash equivalents and other current assets, net		52		63
Total pension assets at fair value	$	4,281	$	3,977
(1) A pooled separate account has several participating benefit plans and each owns a share of the total pool of investments.