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Fair Value Measurements Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value of equity investment in Ferrous Resources prior to acquisition of controlling interest $ 0 $ (36)  
Fair Value, Inputs, Level 3 [Member]      
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Impairment of PP&E 82 10  
Gaming Segment [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Impairment of intangible assets 14    
Gaming Segment [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Transfer out of Level 3 126    
Gaming Segment [Member] | Held-to-maturity Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value of investments measured at fair value on a non-recurring basis 21   $ 9
Holding Company [Member] | Trading Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Purchases of level 3 investment 50 $ 100  
Fair value of investments measured at fair value on a recurring basis 207   $ 157
Energy Segment [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Impairment of goodwill $ 574