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Shareholders' Equity (Details) - $ / shares
shares in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Stockholders' Equity Note [Abstract]    
Common Stock, Par Value (in dollars per share) $ 1 $ 1
Common Shares Authorized (in shares) 1,800  
Common Shares Issued (in shares) 763  
Common Shares Outstanding (in shares) 763  
Preferred Shares Authorized (in shares) 25  
Preferred Shares Issued (in shares) 0  
Preferred Shares Outstanding (in shares) 0  
Common stock, number of votes per share $ 1