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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) $ 1,572   $ 3,899      
Accumulated other comprehensive income (loss) $ 4,610 $ 2,445 3,215 $ 2,674 $ 1,658 $ 718
Cumulative Effect, Adjustment            
Retained Earnings (Accumulated Deficit)     (14)      
Accumulated other comprehensive income (loss)     $ 3