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Organization and Basis of Consolidation and Presentation - Debt Issuance Costs (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Basis of Consolidation and Presentation        
Depreciation and amortization $ 33 $ 107 $ 351 $ 319
Interest expense, net $ 113 109 $ 339 320
ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs | Reclassification due to retrospective application of revised guidance        
Basis of Consolidation and Presentation        
Depreciation and amortization   (2)   (7)
Interest expense, net   $ 2   $ 7