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Other Comprehensive Income and Accumulated Other Comprehensive Income
 12 Months Ended
Dec. 31, 2016
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, 2016, 2015 and 2014.

 
   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
Statement of Income		   Having Credit Losses
Recognized in the
Consolidated
Statement of Income		  

Balance, December 31, 2013

   $ 1,125   $ 197   $ (431 ) $ (81 ) $ 810  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Other comprehensive income (loss) (OCI) before reclassifications

     667     (2 )   (363 )   (250 )   52  

Amounts reclassified from AOCI

     (24 )   3     39     —     18  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net OCI, current period

     643     1     (324 )   (250 )   70  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Balance, December 31, 2014

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

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 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

        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)
  2016   2015   2014  

Changes in net unrealized gains on investment securities:

                    

Having no credit losses recognized in the consolidated statement of income          

   $ (883 ) $ (1,020 ) $ 976  

Income tax expense (benefit)

     (311 )   (352 )   333  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net of taxes

     (572 )   (668 )   643  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Having credit losses recognized in the consolidated statement of income

     21     (14 )   2  

Income tax expense (benefit)

     8     (5 )   1  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net of taxes

     13     (9 )   1  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net changes in benefit plan assets and obligations

     16     66     (494 )

Income tax expense (benefit)

     6     24     (170 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net of taxes

     10     42     (324 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net changes in unrealized foreign currency translation

     (41 )   (461 )   (289 )

Income tax expense (benefit)

     8     (59 )   (39 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net of taxes

     (49 )   (402 )   (250 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total other comprehensive income (loss)

     (887 )   (1,429 )   195  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total income tax expense (benefit)

     (289 )   (392 )   125  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total other comprehensive income (loss), net of taxes

   $ (598 ) $ (1,037 ) $ 70  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

        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.

(for the year ended December 31, in millions)
  2016   2015   2014  

Reclassification adjustments related to unrealized gains on investment securities:

                    

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

   $ (64 ) $ (42 ) $ (36 )

Income tax expense(2)

     (22 )   (15 )   (12 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net of taxes

     (42 )   (27 )   (24 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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

     13     2     4  

Income tax benefit(2)

     4     —     1  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net of taxes

     9     2     3  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Reclassification adjustment related to benefit plan assets and obligations(3)

     62     93     60  

Income tax benefit(2)

     22     33     21  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net of taxes

     40     60     39  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Reclassification adjustment related to foreign currency translation(1)

     —     26     —  

Income tax benefit(2)

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

Net of taxes

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

Total reclassifications

     11     79     28  

Total income tax benefit

     4     27     10  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total reclassifications, net of taxes

   $ 7   $ 52   $ 18  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
(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) general and administrative expenses on the consolidated statement of income.