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Long-Term Debt (Other Debt Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
item
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
item
Sep. 30, 2018
USD ($)
Debt Instrument [Line Items]        
Interest paid on borrowings $ 492 $ 151 $ 810 $ 637
Interest Rate Swap [Member]        
Debt Instrument [Line Items]        
Number of interest rate swaps | item 1   1  
Aggregate notional amount $ 300   $ 300  
Interest Rate Swap, Currently Effective [Member]        
Debt Instrument [Line Items]        
Aggregate notional amount $ 300   $ 300