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Investments (Repurchase Agreements - Securities Lending) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Securities Financing Transaction [Line Items]
Cash collateral on deposit from counterparties	$ 26,527	$ 26,755
Reinvestment portfolio — estimated fair value	26,726	26,704
Repurchase Agreements [Member]
Securities Financing Transaction [Line Items]
Cash collateral on deposit from counterparties	1,400	102
Reinvestment portfolio — estimated fair value	1,409	100
Repurchase Agreements [Member] \| Amortized cost
Securities Financing Transaction [Line Items]
Securities Sold under Agreements to Repurchase	1,367	98
Repurchase Agreements [Member] \| Estimated fair value
Securities Financing Transaction [Line Items]
Securities Sold under Agreements to Repurchase	$ 1,432	$ 113

Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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