Liabilities for Unpaid Claims and Claims Expenses (Tables)

3 Months Ended

Mar. 31, 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)	March 31, 2018		March 31, 2017
Group Disability and Life	$	4,549	$	4,384
Global Supplemental Benefits		492		425
Other Operations		174		197
Unpaid claims and claim expenses	$	5,215	$	5,006

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
(In millions)	March 31, 2018		March 31, 2017
Beginning balance	$	4,975	$	4,726
Less: Reinsurance		137		121
Beginning balance, net		4,838		4,605
Incurred claims related to:
Current year		1,230		1,148
Prior years:
Interest accretion		38		43
All other incurred		(46)		(64)
Total incurred		1,222		1,127
Paid claims related to:
Current year		430		371
Prior years		728		691
Total paid		1,158		1,062
Foreign currency		2		16
Ending balance, net		4,904		4,686
Add: Reinsurance		137		123
Ending balance	$	5,041	$	4,809