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Significant Transactions Schedule of Estimated Fair Value of Consideration Transferred after merger (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 0 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended
Jul. 09, 2013
Jul. 10, 2013
SoftBank Merger [Member]
Jul. 08, 2013
SoftBank Merger [Member]
Oct. 22, 2012
SoftBank Merger [Member]
Dec. 31, 2013
Successor [Member]
Mar. 31, 2013
Successor [Member]
SoftBank Merger [Member]
Dec. 31, 2013
Successor [Member]
SoftBank Merger [Member]
Business Acquisition [Line Items]              
Payments to Acquire Businesses, Gross   $ 16,640          
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value   5,344          
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable 47 193          
Business Combination, Consideration Transferred   22,177          
Convertible Debt       3,100      
Business combination, cost of acquired entity, additional partial cash paid   1,900          
Business combination, consideration transferred and additional equity contributions   27,177          
Business Combination, Acquisition Related Costs     $ 129   $ 100 $ 9 $ 97