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Investments - Investments - Net Realized Capital Gains (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Schedule of Investments [Line Items]
Gross gains on sales	$ 44	$ 19
Gross losses on sales	(21)	(57)
Net OTTI losses recognized in earnings	(2)	0
Transactional foreign currency revaluation	0	1
Total net realized capital gains (losses)	163	(30)
Other net realized capital gains (losses)	165	(30)
Proceeds from Sale of Available-for-sale Securities	4,300	4,300
Equity Securities, FV-NI, Unrealized Gain (Loss)	68	(14)
Net Unrealized Gain on Securities | Reclassification out of Accumulated Other Comprehensive Income
Schedule of Investments [Line Items]
Other net realized capital gains (losses)	21	(38)
Other, net
Schedule of Investments [Line Items]
Other, net	9	(6)
Non-qualifying foreign currency derivatives
Schedule of Investments [Line Items]
Non-qualifying foreign currency derivatives	15	(13)
Non-qualifying foreign currency derivatives | Other Credit Derivatives
Schedule of Investments [Line Items]
Non-qualifying foreign currency derivatives	14	(10)
Foreign Exchange Forward [Member] | Non-qualifying foreign currency derivatives
Schedule of Investments [Line Items]
Non-qualifying foreign currency derivatives	1	(3)
Equity Securities [Member]
Schedule of Investments [Line Items]
Equity securities	$ 132	$ 16

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Amount of unrealized and realized gain (loss) on investment in debt and equity securities.

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