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Income Taxes (Significant Components Of The Company’s Deferred Tax Assets (Liabilities)) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:      
Deferred tax asset arising from the acquisition of interests in IBGLLC $ 140 $ 146 $ 273
Deferred compensation 4 4 6
Other 10 7 18
Total deferred tax assets 154 157 297
Deferred tax liabilities:      
Foreign   1 2
Other 1   1
Total deferred tax liabilities 1 1 3
Net deferred tax assets $ 153 $ 156 $ 294