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Statements of Comprehensive Income - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Statement of Comprehensive Income [Abstract]    
Net income $ 92 $ 112
Other comprehensive income (loss)    
Unrealized AFS gains (losses) (164) 1
Pension and postretirement benefits 1 0
Total other comprehensive income (loss) (163) 1
TOTAL COMPREHENSIVE INCOME (LOSS) $ (71) $ 113