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Income Taxes (Details - Unrecognized Tax Benefits) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2009
Unrecognized tax benefit table [Abstract]        
Unrecognized tax benefits $ 28 $ 29 $ 330  
Additions based on tax positions related to prior years 1 1 5  
Additions based on tax positions related to current year 11 4 2  
Reductions based on tax positions related to prior years (3) (3) (304)  
Settlements with taxing authorities (6) (1) (3)  
Statute of limitations lapses (6) (2) (1)  
Unrecognized tax benefits 25 28 29  
Unrecognized Tax Benefits Text [Line Items]        
Unrecognized Tax Benefits, Period Increase (Decrease) 3      
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 20      
Debt Conversion, Original Debt, Amount       $ 1,700
Decrease in Unrecognized Tax Benefits is Reasonably Possible 6      
Income Tax Examination, Penalties and Interest Accrued 6 $ 10    
Reduction of accrued interest and penalties $ 4      
Tax Years 2007, 2009 and 2010        
Unrecognized Tax Benefits Text [Line Items]        
Unrecognized Tax Benefits, Period Increase (Decrease)     $ (303)  
HONG KONG | Earliest Tax Year        
Unrecognized Tax Benefits Text [Line Items]        
Open Tax Year 2011      
HONG KONG | Latest Tax Year        
Unrecognized Tax Benefits Text [Line Items]        
Open Tax Year 2017      
UNITED KINGDOM | Earliest Tax Year        
Unrecognized Tax Benefits Text [Line Items]        
Open Tax Year 2015      
UNITED KINGDOM | Latest Tax Year        
Unrecognized Tax Benefits Text [Line Items]        
Open Tax Year 2017      
UNITED STATES | Earliest Tax Year        
Unrecognized Tax Benefits Text [Line Items]        
Open Tax Year 2014      
UNITED STATES | Latest Tax Year        
Unrecognized Tax Benefits Text [Line Items]        
Open Tax Year 2017      
Various States | Earliest Tax Year        
Unrecognized Tax Benefits Text [Line Items]        
Open Tax Year 2008      
Various States | Latest Tax Year        
Unrecognized Tax Benefits Text [Line Items]        
Open Tax Year 2017