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Shareholders' Equity And Net Income Per Share Other (Details) - USD ($)
$ in Millions
3 Months Ended 11 Months Ended 12 Months Ended
Mar. 31, 2017
Nov. 22, 2011
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Shareholders' Equity and Net Income Per Share [Line Items]          
Initial Offering Period   November 22, 2011      
Loss Contingency Accrual, Provision     $ 0 $ 10 $ 300
Unsecured Creditors Litigation          
Shareholders' Equity and Net Income Per Share [Line Items]          
Loss Contingency Accrual, Provision       $ 10  
Unsecured Creditors Litigation | Litigation, Damages Benchmark, Fourth LLP Agreement          
Shareholders' Equity and Net Income Per Share [Line Items]          
Loss Contingency Accrual, Provision $ 27        
Other income (expense), net | Unsecured Creditors Litigation | Judicial Ruling          
Shareholders' Equity and Net Income Per Share [Line Items]          
Loss Contingency Accrual, Provision         $ 300