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Derivate Instruments Lorg-term debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Derivative Instruments, Long-term Debt [Abstract]    
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]
Carrying amount of the hedged assets/(liabilities)Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets/(liabilities)
(In millions)2019  2018  2019  2018  
Long-term debt$(1,510) $(505) $(10) $(5) 
 
Long-term Debt [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Hedged Liability, Fair Value Hedge $ 1,510 $ 505
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) $ (10) $ (5)