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Tax (Tables)
3 Months Ended
Mar. 31, 2016
Income Tax Disclosure [Abstract]  
Difference Between Effective Tax Rate

The difference between the effective tax rate reflected in the provision for income taxes and the U.S. federal statutory rate of 35% was as follows (in millions):

 

     Three Months Ended
March 31,
 
     2016      2015  

Federal income tax at U.S. federal statutory rate

   $ (83    $ 176   

Foreign income tax rate differential

     (27      (46

State income tax, net of federal benefit

     (4      4   

Nondeductible expenses

     12         5   

Tax benefit of manufacturing deduction

     —           (10

Foreign dividends, net of foreign tax credits

     5         7   

Tax impact of foreign exchange

     (8      1   

Change in valuation allowance

     10         —     

Tax rate change on temporary differences

     2         (4

Change in tax reserves

     (25      69   

Other

     —           (13
  

 

 

    

 

 

 

Provision for income taxes

   $ (118    $ 189