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Long-term and Short-term Debt (Short-term with Maturities of Year or Less) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Commercial paper $ 99 $ 100
Other Short-term Borrowings 169 377
Short-term Debt 268 477
Average daily balance $ 429 $ 280
Average days outstanding 32 days 27 days