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Long-Term Debt (Other Debt Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]      
Interest paid on borrowings $ 936 $ 852 $ 930
Interest Rate Swap [Member]      
Debt Instrument [Line Items]      
Number of separate interest rate swaps | item 6    
Interest Rate Swap, Currently Effective [Member]      
Debt Instrument [Line Items]      
Aggregate notional amount $ 1,500