Liabilities for Unpaid Claims and Claims Expenses (Tables)

6 Months Ended

Jun. 30, 2017

Group Disability and Life, Global Supplemental Beneftits and Other Operations [Member]

Liability For Unpaid Claims And Claims Adjustment Expense [Line Items]

Liability balance details

(In millions)	June 30, 2017		June 30, 2016
Group Disability and Life	$	4,400	$	4,245
Global Supplemental Benefits		452		373
Other Operations		187		213
Unpaid claims and claim expenses	$	5,039	$	4,831

Group Disability and Life and Global Supplemental Benefits [Member]

Liability For Unpaid Claims And Claims Adjustment Expense [Line Items]

Liability balance details

	Three Months Ended				Six Months Ended
(In millions)	June 30, 2017		June 30, 2016		June 30, 2017		June 30, 2016
Beginning balance	$	4,809	$	4,513	$	4,726	$	4,359
Less: Reinsurance		123		115		121		115
Beginning balance, net		4,686		4,398		4,605		4,244
Incurred claims related to:
Current year		1,076		1,124		2,224		2,112
Prior years:
Interest accretion		40		42		83		85
All other incurred		(7)		(19)		(71)		86
Total incurred		1,109		1,147		2,236		2,283
Paid claims related to:
Current year		703		683		1,074		1,010
Prior years		367		360		1,058		1,020
Total paid		1,070		1,043		2,132		2,030
Foreign currency		(3)		(4)		13		1
Ending balance, net		4,722		4,498		4,722		4,498
Add: Reinsurance		130		120		130		120
Ending balance	$	4,852	$	4,618	$	4,852	$	4,618