Quarterly report pursuant to Section 13 or 15(d)

AVAILABLE-FOR-SALE SECURITIES AVAILABLE-FOR-SALE SECURITIES - Gross Realized Gains (Details)

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AVAILABLE-FOR-SALE SECURITIES AVAILABLE-FOR-SALE SECURITIES - Gross Realized Gains (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]        
Gross gains on sales of securities $ 0 $ 4 $ 6 $ 8
Gross (losses) on sales of securities 2 4 8 4
Net (loss) gain on sales of securities (2) 0 (2) 4
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 0 0 0 (4)
Gain (Loss) on Sale of Investments $ (2) $ 0 $ (2) $ 0