XML 134 R92.htm IDEA: XBRL DOCUMENT v3.10.0.1
Common Stock (Equity Securities Offering) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 20, 2018
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2018
Forward Contract Indexed to Issuer's Equity [Line Items]        
Maximum Value Of Shares To Be Issued Under ATM Program $ 1,000      
Proceeds from the issuance of common stock       $ 820
Forward Contract Indexed to Issuer's Equity, Shares       0.9
ATM [Member]        
Forward Contract Indexed to Issuer's Equity [Line Items]        
Settlement Alternatives, Shares   2.6   2.6
ATM [Member] | Wells Fargo Bank [Member]        
Forward Contract Indexed to Issuer's Equity [Line Items]        
Shares offered   1.3   1.3
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share   $ 72.02    
ATM [Member] | Citibank [Member]        
Forward Contract Indexed to Issuer's Equity [Line Items]        
Shares offered   1.3   1.3
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share   $ 78.71    
Equity Forwards [Member]        
Forward Contract Indexed to Issuer's Equity [Line Items]        
Shares offered     21.3  
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share     $ 74.07  
Sales price     $ 75  
Settlement Alternatives, Shares     21.3  
Shares, Issued   10.6   10.6
Proceeds from the issuance of common stock   $ 781