Liabilities for Unpaid Claims and Claims Expenses (Tables)

6 Months Ended

Jun. 30, 2018

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, 2018		June 30, 2017
Group Disability and Life	$	4,573	$	4,400
Global Supplemental Benefits		480		452
Other Operations		193		187
Unpaid claims and claim expenses	$	5,246	$	5,039

Group Disability and Life and Global Supplemental Benefits [Member]

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

Liability balance details

	Six Months Ended
(In millions)	June 30, 2018		June 30, 2017
Beginning balance	$	4,975	$	4,726
Less: Reinsurance		137		121
Beginning balance, net		4,838		4,605
Incurred claims related to:
Current year		2,382		2,224
Prior years:
Interest accretion		77		83
All other incurred		(66)		(71)
Total incurred		2,393		2,236
Paid claims related to:
Current year		1,204		1,074
Prior years		1,101		1,058
Total paid		2,305		2,132
Foreign currency		(14)		13
Ending balance, net		4,912		4,722
Add: Reinsurance		141		130
Ending balance	$	5,053	$	4,852