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Investments (Common Stock Investments with Readily Determinable Fair Value ) (Details) - USD ($)
shares in Millions, $ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Jan. 01, 2018
Accumulated Other Comprehensive Income | Accounting Standards Update 2016-01        
Debt Securities, Available-for-sale [Line Items]        
Reclassification of accumulated other comprehensive income to retained earnings       $ (32)
Cumulative effect of new accounting principle in period of adoption       (26)
Retained Earnings | Accounting Standards Update 2016-01        
Debt Securities, Available-for-sale [Line Items]        
Reclassification of accumulated other comprehensive income to retained earnings       32
Cumulative effect of new accounting principle in period of adoption       26
Lionsgate Collar        
Debt Securities, Available-for-sale [Line Items]        
Purchase of available for sale securities (in shares) 5      
Purchase of stock, percentage ownership after transaction 3.00%      
Cost $ 195 $ 195 $ 195  
Equity securities recognized in other expense, net   (44) (1)  
Unhedged equity securities recorded in other comprehensive income   0 32  
Other-than-temporary impairment   (62) (62)  
Carrying value $ 121 $ 121 164  
Percentage of shares pledged as collateral 50.00% 50.00%    
Lionsgate Collar | Accumulated Other Comprehensive Income | Accounting Standards Update 2016-01        
Debt Securities, Available-for-sale [Line Items]        
Reclassification of accumulated other comprehensive income to retained earnings     $ 0 $ (32)