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DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Managemen Add Info (Details Add Info)

v3.10.0.1
DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Managemen Add Info (Details Add Info) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Derivative [Line Items]    
Derivative, Notional Amount $ 5,727 $ 8,375
Additional information about the interest rate swaps used in companies Asset and Liability Management    
Notional Value $ 5,727 8,375
Average Maturity (years) 2 years 6 months  
Fair Value $ (50) $ (99)
Asset conversion swaps - Receive Fixed - Generic    
Additional information about the interest rate swaps used in companies Asset and Liability Management    
Notional Value $ 12  
Average Maturity (years) 1 year 8 months 12 days 0 years
Fair Value $ 0  
Weighted-Average Rate Receive 2.20%  
Weighted-Average Rate Pay 2.16%  
Liability conversion swaps - Receive Fixed - Generic    
Additional information about the interest rate swaps used in companies Asset and Liability Management    
Notional Value $ 5,715 $ 8,375
Average Maturity (years) 2 years 2 months 12 days 2 years 6 months
Fair Value $ (50) $ (99)
Weighted-Average Rate Receive 2.08% 1.56%
Weighted-Average Rate Pay 2.26% 1.44%