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Segment Information (Reconciliation Of Segment Profit To Consolidated Operating Income) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Depreciation                 $ (119) $ (126) $ (126)
Acquisition-related contingent consideration                 0 3 35
Restructuring and other charges                 0 0 1
Stock-based compensation                 $ (178) (144) (150)
Loss on license intellectual property commitment                 (122) 0
Operating income $ 536 $ (31) $ (119) $ 512 $ 400 $ 162 $ 24 $ 362 $ 898 948 33
EA Segment                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Net Revenue before Revenue Deferral                 4,566 4,319 4,021
Depreciation                 (119) (126) (126)
Other expenses                 (3,147) (3,117) (3,178)
Operating income                 1,300 1,076 717
Other Reconciling Items To Consolidated Operating Income (Loss) [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenue deferral                 (3,783) (3,536) (3,350)
Recognition of revenue deferral                 3,613 3,732 2,904
Amortization of intangibles                 (54) (66) (76)
Acquisition-related contingent consideration                 0 3 35
Restructuring and other charges                 0 0 1
Stock-based compensation                 (178) (144) (150)
Loss on license intellectual property commitment                   (122)  
Other expenses                 0 5 (48)
Operating income                 $ 898 $ 948 $ 33