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Basis of Presentation (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Deferred gain on receipt of property   $ 9 $ 69  
Assets held in rabbi trusts $ 153 153   $ 147
Financing Receivable, after Allowance for Credit Loss 32 32    
Receivable with Imputed Interest, Discount 16 16    
Related Party Transaction [Line Items]        
Long-term Debt 2,276 2,276   1,286
Mississippi Economic Development Revenue Bonds Due May 1, 2024, 7.81% | Bonds        
Related Party Transaction [Line Items]        
Long-term Debt 84 84   $ 84
COVID-19 Events [Member]        
Change in Accounting Estimate        
Increase (decrease) in operating income due to net cumulative catch-up adjustments $ 61 $ 61