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Note 2. Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Minimum ownership percentage for consolidation 50.00%      
Restricted Cash and Cash Equivalents $ 7 $ 8    
Advertising Expense 198 194 $ 188  
Goodwill 3,690 $ 3,618 $ 3,477 $ 3,335
Indefinite-Lived Intangible Assets (Excluding Goodwill) $ 766      
Percentage by which the estimated fair value of each reporting unit is lowered during goodwill evaluation 10.00% 10.00% 10.00%  
Maximum [Member]        
Remaining maturity of highly-liquid investments 3 months