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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2015
Income Tax Disclosure [Abstract]  
Unrecognized tax benefits
UNRECOGNIZED TAX BENEFITS
(In millions)March 31, 2015December 31, 2014
Unrecognized tax benefits$5,444$5,619
Portion that, if recognized, would reduce tax expense and effective tax rate(a)4,0204,059
Accrued interest on unrecognized tax benefits814807
Accrued penalties on unrecognized tax benefits96103
Reasonably possible reduction to the balance of unrecognized tax benefits
in succeeding 12 months0-8000-900
Portion that, if recognized, would reduce tax expense and effective tax rate(a)0-3000-300

(a) Some portion of such reduction may be reported as discontinued operations.