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Statutory Net Income and Surplus and Dividend Restrictions (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statutory Accounting Practices [Line Items]                      
Statutory net income (loss)                 $ (852,000,000) $ 3,911,000,000 $ (2,018,000,000)
Statutory surplus $ 6,396,000,000       $ 8,059,000,000       6,396,000,000 $ 8,059,000,000  
Divided the Company is permitted to pay without prior approval in 2019 0               $ 0    
Extra-ordinary dividend                      
Statutory Accounting Practices [Line Items]                      
Statutory surplus dividend paid to PAI $ 225,000,000 $ 250,000,000 $ 250,000,000 $ 300,000,000 $ 650,000,000 $ 200,000,000 $ 100,000,000 $ 1,140,000,000