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Fair Value of Financial Instruments (Unaudited) Long-term Debt (Details 3) - USD ($)
$ in Millions
Oct. 15, 2020
Sep. 30, 2020
Mar. 23, 2020
Dec. 31, 2019
Debt Instrument [Line Items]        
Debt Instrument, Face Amount     $ 2,250  
Debt and Lease Obligation   $ 16,100   $ 13,900
Long-term Debt, Fair Value   $ 19,100   $ 15,100
Two Thousand Thirty [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount     $ 750  
Debt Instrument, Interest Rate, Stated Percentage     4.40%  
Two Thousand Forty 2 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount     $ 500  
Debt Instrument, Interest Rate, Stated Percentage     5.15%  
Two Thousand Fifty [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount     $ 1,000  
Debt Instrument, Interest Rate, Stated Percentage     5.25%  
Subsequent Event [Member]        
Debt Instrument [Line Items]        
Repayments of Notes Payable $ 1,000