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Segment Information - Schedule of Reconciliation of Reportable Segment Depreciation and Amortization Amounts to the Consolidated Balances (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting Information [Line Items]    
Segment depreciation and amortization $ 228 $ 245
Amortization of initial payments for new contracts 15 11
Total consolidated depreciation and amortization per unaudited consolidated statements of cash flows 262 277
Amortization of equity method investments (9) (15)
Amortization of initial payments for new contracts (15) (11)
Total consolidated depreciation and amortization per unaudited consolidated statements of operations 238 251
Segment Reconciling Items    
Segment Reporting Information [Line Items]    
Adjustments for non wholly owned entities 19 21
Amortization of initial payments for new contracts 15 11
Amortization of equity method investments (9) (15)
Amortization of initial payments for new contracts (15) (11)
Total consolidated depreciation and amortization per unaudited consolidated statements of operations $ 238 $ 251