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Income Taxes (Significant Components Of The Company’s Deferred Tax Assets (Liabilities)) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:      
Deferred tax asset arising from the acquisition of interests in IBGLLC $ 116 $ 140 $ 146
Deferred compensation 5 4 4
Other 11 10 7
Total deferred tax assets 132 154 157
Deferred tax liabilities:      
Foreign 1   1
Other 3 1  
Total deferred tax liabilities 4 1 1
Net deferred tax assets $ 128 $ 153 $ 156