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Other Comprehensive Income and Accumulated Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 30, 2018
Other Comprehensive Income and Accumulated Other Comprehensive Income disclosure  
Changes in accumulated other comprehensive income (loss) (AOCI) [Table Text Block]
The following table presents the changes in the Company’s accumulated other comprehensive income (loss) (AOCI) for the six months ended June 30, 2018.
 
 
Changes in Net Unrealized Gains (Losses) on
Investment Securities
 
 
 
 
 
 
(in millions)
 
Having No Credit
Losses Recognized in
the Consolidated
Statement of Income
 
Having Credit 
Losses Recognized 
in the Consolidated
Statement of 
Income
 
Net Benefit Plan Assets and
Obligations
Recognized in
Shareholders’ 
Equity
 
Net Unrealized
Foreign Currency
Translation
 
Total Accumulated
Other
Comprehensive
Income (Loss)
 
 
 
 
 
 
 
 
 
 
 
Balance, December 31, 2017
 
$
747

 
$
207

 
$
(686
)
 
$
(611
)
 
$
(343
)
Cumulative effect of adoption of updated accounting guidance for equity financial instruments at January 1, 2018
 
(34
)
 
—

 
—

 
—

 
(34
)
Income tax benefit
 
(12
)
 
—

 
—

 
—

 
(12
)
Net of income taxes
 
(22
)
 
—

 
—

 
—

 
(22
)
 
 
 
 
 
 
 
 
 
 
 
Reclassification of certain tax effects from accumulated other comprehensive income at January 1, 2018
 
145

 
7

 
(141
)
 
(35
)
 
(24
)
Total effect of adoption of new guidance at January 1, 2018, net of tax
 
123

 
7

 
(141
)
 
(35
)
 
(46
)
 
 
 
 
 
 
 
 
 
 
 
Other comprehensive income (loss) (OCI) before reclassifications, net of tax
 
(1,176
)
 
(11
)
 
—

 
(137
)
 
(1,324
)
Amounts reclassified from AOCI, net of tax
 
(9
)
 
—

 
34

 
—

 
25

Net OCI, current period
 
(1,185
)
 
(11
)
 
34

 
(137
)
 
(1,299
)
Balance, June 30, 2018
 
$
(315
)
 
$
203

 
$
(793
)
 
$
(783
)
 
$
(1,688
)
Pre-tax components of other comprehensive income (loss) and the related income tax expense (benefit) for each component [Table Text Block]
The following table presents the pre-tax components of the Company’s other comprehensive income (loss) and the related income tax expense (benefit).
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(in millions)
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
 
Changes in net unrealized gains (losses) on investment securities:
 
 

 
 

 
 

 
 

Having no credit losses recognized in the consolidated statement of income
 
$
(298
)
 
$
327

 
$
(1,501
)
 
$
471

Income tax expense (benefit)
 
(63
)
 
116

 
(316
)
 
167

Net of taxes
 
(235
)
 
211

 
(1,185
)
 
304

 
 
 
 
 
 
 
 
 
Having credit losses recognized in the consolidated statement of income
 
(12
)
 
2

 
(14
)
 
2

Income tax expense (benefit)
 
(2
)
 
1

 
(3
)
 
1

Net of taxes
 
(10
)
 
1

 
(11
)
 
1

 
 
 
 
 
 
 
 
 
Net changes in benefit plan assets and obligations
 
21

 
17

 
43

 
34

Income tax expense
 
4

 
6

 
9

 
11

Net of taxes
 
17

 
11

 
34

 
23

 
 
 
 
 
 
 
 
 
Net changes in unrealized foreign currency translation
 
(158
)
 
48

 
(152
)
 
89

Income tax expense (benefit)
 
(20
)
 
—

 
(15
)
 
6

Net of taxes
 
(138
)
 
48

 
(137
)
 
83

 
 
 
 
 
 
 
 
 
Total other comprehensive income (loss)
 
(447
)
 
394

 
(1,624
)
 
596

Total income tax expense (benefit)
 
(81
)
 
123

 
(325
)
 
185

Total other comprehensive income (loss), net of taxes
 
$
(366
)
 
$
271

 
$
(1,299
)
 
$
411
Pre-tax and related income tax (expense) benefit components of the amounts reclassified from accumulated other comprehensive income to the consolidated statement of income [Table Text Block]
The following table presents the pre-tax and related income tax (expense) benefit components of the amounts reclassified from the Company’s AOCI to the Company’s consolidated statement of income.
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(in millions)
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
 
Reclassification adjustments related to unrealized gains (losses) on investment securities:
 
 
 
 
 
 

 
 

Having no credit losses recognized in the consolidated statement of income (1)
 
$
(12
)
 
$
(84
)
 
$
(12
)
 
$
(94
)
Income tax expense (2)
 
(3
)
 
(30
)
 
(3
)
 
(33
)
Net of taxes
 
(9
)
 
(54
)
 
(9
)
 
(61
)
 
 
 
 
 
 
 
 
 
Having credit losses recognized in the consolidated statement of income (1)
 
—

 
—

 
—

 
—

Income tax benefit (2)
 
—

 
—

 
—

 
—

Net of taxes
 
—

 
—

 
—

 
—

 
 
 
 
 
 
 
 
 
Reclassification adjustment related to benefit plan assets and obligations:
 
 

 
 

 
 

 
 

Claims and claim adjustment expenses (3)
 
8

 
7

 
17

 
14

General and administrative expenses (3)
 
13

 
11

 
26

 
21

Total
 
21

 
18

 
43

 
35

Income tax benefit (2)
 
4

 
7

 
9

 
12

Net of taxes
 
17

 
11

 
34

 
23

 
 
 
 
 
 
 
 
 
Reclassification adjustment related to foreign currency translation (1)
 
—

 
—

 
—

 
—

Income tax benefit (2)
 
—

 
—

 
—

 
—

Net of taxes
 
—

 
—

 
—

 
—

 
 
 
 
 
 
 
 
 
Total reclassifications
 
9

 
(66
)
 
31

 
(59
)
Total income tax (expense) benefit
 
1

 
(23
)
 
6

 
(21
)
Total reclassifications, net of taxes
 
$
8

 
$
(43
)
 
$
25

 
$
(38
)
 _________________________________________________________
(1)   (Increases) decreases net realized investment gains on the consolidated statement of income.
(2)   (Increases) decreases income tax expense on the consolidated statement of income.
(3)    Increases (decreases) expenses on the consolidated statement of income.