XML 71 R38.htm IDEA: XBRL DOCUMENT v3.2.0.727
Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Income Tax [Line Items]    
Income tax expense $ 256 $ 185
Income tax benefit discrete items 5 12
Unrecognized tax benefits 497  
Unrecognized tax benefits that would impact income tax expense and the effective tax rate 337  
Significant change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit 131  
Income tax examination, penalties and interest expense 6 4
Accrued interest and penalties on unrecognized tax benefits 75 161
Canada revenue agency assessments    
Income Tax [Line Items]    
Income tax expense to settle transfer pricing $ 12  
Internal revenue service (IRS)    
Income Tax [Line Items]    
Income tax benefit discrete items   $ 17