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Business, Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2020
USD ($)
Segment
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Number of Reportable Segments | Segment 3          
Retained Earnings (Accumulated Deficit) $ (3,523)   $ (585)      
Accumulated other comprehensive income (loss) $ 4,965 $ 2,647 3,240 $ 2,702 $ 1,670 $ 716
Cumulative Effect, Adjustment            
Retained Earnings (Accumulated Deficit)     (14)      
Accumulated other comprehensive income (loss)     $ 3