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Fair Value Measurements (Aggregate Fair Value of Derivative Financial Instruments, Equity Securities and Debt (Details)
$ in Millions
9 Months Ended
Sep. 30, 2020
USD ($)
Liabilities:  
Equity securities, unrealized gain (loss) $ (78)
Equity securities, unrealized gain (loss), net (62)
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member]  
Assets:  
Equity securities 244
Derivative contracts 0
Total assets 244
Liabilities:  
Debt 32,763
Derivative contracts 0
Total liabilities 32,763
Significant Other Observable Inputs (Level 2) [Member]  
Assets:  
Equity securities 0
Derivative contracts 254
Total assets 254
Liabilities:  
Debt 171
Derivative contracts 565
Total liabilities 736
Significant Unobservable Inputs (Level 3) [Member]  
Assets:  
Equity securities 0
Derivative contracts 0
Total assets 0
Liabilities:  
Debt 0
Derivative contracts 0
Total liabilities 0
Fair Value [Member]  
Assets:  
Equity securities 244
Derivative contracts 254
Total assets 498
Liabilities:  
Debt 32,934
Derivative contracts 565
Total liabilities $ 33,499