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Stockholders' Equity (Common Stock) (Details) - USD ($)
$ / shares in Units, shares in Thousands
1 Months Ended 2 Months Ended 12 Months Ended
Nov. 30, 2019
Apr. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Feb. 28, 2018
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Forward Contract Indexed to Issuer's Equity [Line Items]                    
Maximum value of shares to be issued under ATM program $ 1,500,000,000         $ 1,000,000,000        
Shares Issue, Under Net Share Settle Election               1,600    
Stock Issued During Period, Shares, Dividend Reinvestment Plan               1,800 2,200  
Stock Issued During Period, Value, Dividend Reinvestment Plan               $ 160,000,000 $ 174,000,000  
ATM                    
Forward Contract Indexed to Issuer's Equity [Line Items]                    
Shares offered   1,100 1,100       1,600      
Settlement Alternatives, Shares       2,600         2,600  
Proceeds from Issuance or Sale of Equity       $ 195,000,000            
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share $ 85.99 $ 88.82 $ 89.83       $ 86.23      
Tranche 1                    
Forward Contract Indexed to Issuer's Equity [Line Items]                    
Shares offered         1,300          
Tranche 2                    
Forward Contract Indexed to Issuer's Equity [Line Items]                    
Shares offered         1,300          
Equity forwards                    
Forward Contract Indexed to Issuer's Equity [Line Items]                    
Shares offered 28,750                 21,300
Settlement Alternatives, Shares                   21,300
Proceeds from Issuance or Sale of Equity       $ 766,000,000 $ 781,000,000     $ 331,000,000    
Shares issued (in shares)       10,600 10,600     3,800 10,600