OTHER INCOME (EXPENSE), NET Other Income (Expense) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue from Contract with Customer, Including Assessed Tax	$ 1	$ 1
Other income	4	126
Other Nonoperating Expense	(10)	(7)
Public Utilities, Allowance for Funds Used During Construction, Additions	0	3
Other Nonoperating Income (Expense)	$ (5)	123
Interest Rate Contract | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) Reclassified from Deferred Accounts into Income		115
Other Income [Member] | Interest Rate Contract | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) Reclassified from Deferred Accounts into Income		$ 115