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Other Comprehensive Income and Accumulated Other Comprehensive Income
 12 Months Ended
Dec. 31, 2017
Other Comprehensive Income and Accumulated Other Comprehensive Income disclosure  
Other Comprehensive Income and Accumulated Other Comprehensive Income disclosure [Text Block]

10. OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME

        The following table presents the changes in the Company's accumulated other comprehensive income (AOCI) for the years ended December 31, 2017, 2016 and 2015.

 
   Changes in Net
Unrealized Gains
on Investment
Securities		    
    
    
  
 
   Net Benefit Plan
Assets and
Obligations
Recognized in
Shareholders'
Equity		    
    
  
 
   Net
Unrealized
Foreign
Currency
Translation		   Total
Accumulated
Other
Comprehensive
Income (Loss)		  
(in millions)
  Having No Credit
Losses Recognized
in the Consolidated
Statements of Income		   Having Credit Losses
Recognized in the
Consolidated
Statements of Income		  

Balance, December 31, 2014

   $ 1,768   $ 198   $ (755 ) $ (331 ) $ 880  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Other comprehensive income (loss) (OCI) before reclassifications

     (641 )   (11 )   (18 )   (419 )   (1,089 )

Amounts reclassified from AOCI

     (27 )   2     60     17     52  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net OCI, current period

     (668 )   (9 )   42     (402 )   (1,037 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Balance, December 31, 2015

     1,100     189     (713 )   (733 )   (157 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

OCI before reclassifications

     (530 )   4     (30 )   (49 )   (605 )

Amounts reclassified from AOCI

     (42 )   9     40     —     7  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net OCI, current period

     (572 )   13     10     (49 )   (598 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Balance, December 31, 2016

     528     202     (703 )   (782 )   (755 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

OCI before reclassifications

     367     4     (24 )   171     518  

Amounts reclassified from AOCI

     (148 )   1     41     —     (106 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net OCI, current period

     219     5     17     171     412  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Balance, December 31, 2017

   $ 747   $ 207   $ (686 ) $ (611 ) $ (343 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

        The following table presents the pre-tax components of the Company's other comprehensive income (loss) and the related income tax expense (benefit).

(for the year ended December 31, in millions)
  2017   2016   2015  

Changes in net unrealized gains on investment securities:

                    

Having no credit losses recognized in the consolidated statements of income

   $ 294   $ (883 ) $ (1,020 )

Income tax expense (benefit)

     75     (311 )   (352 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net of taxes

     219     (572 )   (668 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Having credit losses recognized in the consolidated statements of income

     8     21     (14 )

Income tax expense (benefit)

     3     8     (5 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net of taxes

     5     13     (9 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net changes in benefit plan assets and obligations

     29     16     66  

Income tax expense

     12     6     24  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net of taxes

     17     10     42  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net changes in unrealized foreign currency translation

     191     (41 )   (461 )

Income tax expense (benefit)

     20     8     (59 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net of taxes

     171     (49 )   (402 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total other comprehensive income (loss)

     522     (887 )   (1,429 )

Total income tax expense (benefit)

     110     (289 )   (392 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total other comprehensive income (loss), net of taxes

   $ 412   $ (598 ) $ (1,037 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

        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 statements of income.

(for the year ended December 31, in millions)
  2017   2016   2015  

Reclassification adjustments related to unrealized gains on investment securities:

                    

Having no credit losses recognized in the consolidated statements of income(1)

   $ (228 ) $ (64 ) $ (42 )

Income tax expense(2)

     (80 )   (22 )   (15 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net of taxes

     (148 )   (42 )   (27 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Having credit losses recognized in the consolidated statements of income(1)

     1     13     2  

Income tax benefit(2)

     —     4     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net of taxes

     1     9     2  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Reclassification adjustment related to benefit plan assets and obligations:

                    

Claims and claim adjustment expenses(3)

     32     25     38  

General and administrative expenses(3)

     48     37     55  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

     80     62     93  

Income tax benefit(2)

     39     22     33  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net of taxes

     41     40     60  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Reclassification adjustment related to foreign currency translation(1)

     —     —     26  

Income tax benefit(2)

     —     —     9  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net of taxes

     —     —     17  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total reclassifications

     (147 )   11     79  

Total income tax (expense) benefit

     (41 )   4     27  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total reclassifications, net of taxes

   $ (106 ) $ 7   $ 52  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
(1)
(Increases) decreases net realized investment gains on the consolidated statements of income.

(2)
(Increases) decreases income tax expense on the consolidated statements of income.

(3)
Increases (decreases) expenses on the consolidated statements of income.