Long-Term Debt (Other Debt Narrative) (Details) $ in Millions	3 Months Ended
Mar. 31, 2019 USD ($) item	Mar. 31, 2018 USD ($)
Debt Instrument [Line Items]
Interest paid on borrowings	$ 189	$ 212
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Number of separate interest rate swaps \| item	3
Interest Rate Swap, Currently Effective [Member]
Debt Instrument [Line Items]
Aggregate notional amount	$ 700

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