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Income Taxes (Significant Components Of The Company’s Deferred Tax Assets (Liabilities)) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:      
Deferred tax asset arising from the acquisition of interests in IBGLLC $ 146 $ 273 $ 288
Deferred compensation 4 6 5
Other 7 18 18
Total deferred tax assets 157 297 311
Deferred tax liabilities:      
Foreign, primarily THE 1 2 3
Other   1  
Total deferred tax liabilities 1 3 3
Net deferred tax assets $ 156 $ 294 $ 308