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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 372	$ 582	$ 1,002	$ 1,179
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Changes in net unrealized gain on securities	664	(1,138)	1,343	(1,993)
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income Loss, Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities	0	2	1	0
Changes in net gain on cash flow hedging instruments	11	12	16	(32)
Changes in foreign currency translation adjustments	3	1	4	(5)
Changes in pension and other postretirement plan adjustments	9	9	17	19
OCI, net of tax	687	(1,114)	1,381	(2,011)
Comprehensive income (loss)	$ 1,059	$ (532)	$ 2,383	$ (832)

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