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Statements of Comprehensive Income - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of Comprehensive Income [Abstract]      
Net income $ 384 $ 460 $ 518
Other comprehensive income (loss)      
Unrealized gains (losses) on available-for-sale securities (39) (31) 132
Pension and postretirement benefits (1) 1 0
Total other comprehensive income (loss) (40) (30) 132
TOTAL COMPREHENSIVE INCOME (LOSS) $ 344 $ 430 $ 650