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Accumulated Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2018
Accumulated Other Comprehensive Income [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(Dollars in millions)
Three months ended March 31,
 
2018
 
 
2017
 
Before tax
 
Income tax
 
Net
 
 
Before tax
 
Income tax
 
Net
Investments:
 
 
 
 
 
 
 
 
 
 
 
 
AOCI, beginning of period
$
3,540

 
$
733

 
$
2,807

 
 
$
2,625

 
$
908

 
$
1,717

Cumulative effect of change in accounting for equity securities as of January 1, 2018
(3,155
)
 
(652
)
 
(2,503
)
 
 
—

 
—

 
—

Adjusted AOCI, beginning of period
385

 
81

 
304

 
 
2,625

 
908

 
1,717

OCI before investment gains recognized in net income
(217
)
 
(45
)
 
(172
)
 
 
290

 
102

 
188

Investment gains recognized in net income
(4
)
 
(1
)
 
(3
)
 
 
(159
)
 
(56
)
 
(103
)
OCI
(221
)
 
(46
)
 
(175
)
 
 
131

 
46

 
85

AOCI, end of period
$
164

 
$
35

 
$
129

 
 
$
2,756

 
$
954

 
$
1,802

 
 
 
 
 
 
 
 
 
 
 
 
 
Pension obligations:
 
 
 
 
 
 
 
 
 
 
 
 
AOCI, beginning of period
$
(12
)
 
$
(1
)
 
$
(11
)
 
 
$
(26
)
 
$
(8
)
 
$
(18
)
OCI excluding amortization recognized in net income
—

 
—

 
—

 
 
—

 
—

 
—

Amortization recognized in net income
—

 
—

 
—

 
 
1

 
—

 
1

OCI
—

 
—

 
—

 
 
1

 
—

 
1

AOCI, end of period
$
(12
)
 
$
(1
)
 
$
(11
)
 
 
$
(25
)
 
$
(8
)
 
$
(17
)
 
 
 
 
 
 
 
 
 
 
 
 
 
Life deferred acquisition costs, life policy reserves and other:
 
 
 
 
 
 
 
 
 
 
 
 
AOCI, beginning of period
$
(10
)
 
$
(2
)
 
$
(8
)
 
 
$
(9
)
 
$
(3
)
 
$
(6
)
OCI before realized gains and losses recognized in net
  income
6

 
1

 
5

 
 
3

 
2

 
1

Realized gains recognized in net income
—

 
—

 
—

 
 
(1
)
 
(1
)
 
—

OCI
6

 
1

 
5

 
 
2

 
1

 
1

AOCI, end of period
$
(4
)
 
$
(1
)
 
$
(3
)
 
 
$
(7
)
 
$
(2
)
 
$
(5
)
 
 
 
 
 
 
 
 
 
 
 
 
 
Summary of AOCI:
 
 
 
 
 
 
 
 
 
 
 
 
AOCI, beginning of period
$
3,518

 
$
730

 
$
2,788

 
 
$
2,590

 
$
897

 
$
1,693

Cumulative effect of change in accounting for equity securities as of January 1, 2018
(3,155
)
 
(652
)
 
(2,503
)
 
 
—

 
—

 
—

Adjusted AOCI, beginning of period
363

 
78

 
285

 
 
2,590

 
897

 
1,693

Investments OCI
(221
)
 
(46
)
 
(175
)
 
 
131

 
46

 
85

Pension obligations OCI
—

 
—

 
—

 
 
1

 
—

 
1

Life deferred acquisition costs, life policy reserves and other OCI
6

 
1

 
5

 
 
2

 
1

 
1

Total OCI
(215
)
 
(45
)
 
(170
)
 
 
134

 
47

 
87

AOCI, end of period
$
148

 
$
33

 
$
115

 
 
$
2,724

 
$
944

 
$
1,780