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Accounting Policies (Details) - USD ($)
$ in Millions
3 Months Ended
Oct. 01, 2015
Mar. 31, 2015
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Debt Instrument [Line Items]          
Deferred financing fees     $ 43 $ 48  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | GDTNA          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Noncontrolling interest, ownership percentage by parent 75.00%        
Disposal Group, Disposed of by Sale, Not Discontinued Operations | DGT          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Equity method investment, ownership percentage 25.00%        
NGY          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Equity method investment, ownership percentage         25.00%
Equity method investment, ownership percentage by SRI         75.00%
Ownership interest acquired 75.00%        
GDTNA          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Noncontrolling interest, ownership percentage by SRI         25.00%
GDTNA | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Noncontrolling interest, ownership percentage by parent         75.00%
DGT | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Equity method investment, ownership percentage         25.00%
GDTE          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Noncontrolling interest, ownership percentage by parent         75.00%
Noncontrolling interest, ownership percentage by SRI         25.00%
Noncontrolling interest acquired 25.00%        
Other (Income) Expense | Adjustments for New Accounting Pronouncement          
Debt Instrument [Line Items]          
Amortization of financing fees   $ (4)      
Interest Expense | Adjustments for New Accounting Pronouncement          
Debt Instrument [Line Items]          
Amortization of financing fees   $ 4      
DGT          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Equity method investment, ownership percentage by SRI         75.00%
Prepaid Expenses and Other Current Assets | Adjustments for New Accounting Pronouncement          
Debt Instrument [Line Items]          
Deferred financing fees       (15)  
Other Assets | Adjustments for New Accounting Pronouncement          
Debt Instrument [Line Items]          
Deferred financing fees       (33)  
Long Term Debt and Capital Leases Due Within One Year | Adjustments for New Accounting Pronouncement          
Debt Instrument [Line Items]          
Deferred financing fees       2  
Long Term Debt and Capital Leases | Adjustments for New Accounting Pronouncement          
Debt Instrument [Line Items]          
Deferred financing fees       $ 46