CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 5,447	$ (709)
Other comprehensive income (loss) net of income taxes:
Change in unrealized gains (losses), net of reclassification adjustment	1,434	834
Changes in defined benefit plan related items not yet recognized in periodic benefit cost, net of reclassification adjustment	28	49
Foreign currency translation adjustment	(21)	(1)
Total other comprehensive income (loss), net of income taxes	1,441	882
Comprehensive income (loss)	6,888	173
Less: Comprehensive income (loss) attributable to the noncontrolling interest	29	65
Comprehensive income (loss) attributable to Holdings	$ 6,859	$ 108