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Fair Value of Financial Instruments (Carrying and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
AFS securities: |  |  |
AFS Fixed Maturity Securities |  | $ 93,767 | $ 89,013
Variable interest entities' fixed maturity securities |  |  | 200
AFS Equity securities |  | 302 | 275
Trading securities |  | 1,665 | 1,712
Mortgage loans on real estate |  | 10,382 | 9,889
Derivative investments |  | 960 | 927
Other investments |  | 2,210 | 2,230
Carrying Value [Member] |  |  |
AFS securities: |  |  |
AFS Equity securities |  | 302 | 275
Trading securities |  | 1,665 | 1,712
Mortgage loans on real estate |  | 10,382 | 9,889
Derivative investments | [1] | 960 | 927
Other investments |  | 2,210 | 2,230
Cash and invested cash |  | 1,965 | 2,722
Separate account assets |  | 139,612 | 128,397
Future contract benefits: |  |  |
Indexed annuity and IUL contracts embedded derivatives |  | (1,318) | (1,139)
Other contract holder funds: |  |  |
Remaining guaranteed interest and similar contracts |  | (612) | (629)
Account values of certain investment contracts |  | (32,089) | (31,516)
Short-term debt |  | (450) |
Long-term debt |  | (4,900) | (5,345)
Reinsurance related embedded derivatives |  | (63) | (53)
Fair Value [Member] |  |  |
AFS securities: |  |  |
AFS Equity securities |  | 302 | 275
Trading securities |  | 1,665 | 1,712
Mortgage loans on real estate |  | 10,487 | 9,853
Derivative investments | [1] | 960 | 927
Other investments |  | 2,210 | 2,230
Cash and invested cash |  | 1,965 | 2,722
Separate account assets |  | 139,612 | 128,397
Future contract benefits: |  |  |
Indexed annuity and IUL contracts embedded derivatives |  | (1,318) | (1,139)
Other contract holder funds: |  |  |
Remaining guaranteed interest and similar contracts |  | (612) | (629)
Account values of certain investment contracts |  | (36,281) | (35,647)
Short-term debt |  | (453) |
Long-term debt |  | (5,455) | (5,679)
Reinsurance related embedded derivatives |  | (63) | (53)
VIEs' fixed maturity securities [Member] | Carrying Value [Member] |  |  |
AFS securities: |  |  |
Variable interest entities' fixed maturity securities |  |  | 200
VIEs' fixed maturity securities [Member] | Fair Value [Member] |  |  |
AFS securities: |  |  |
Variable interest entities' fixed maturity securities |  |  | 200
Fixed maturity AFS securities [Member] | Carrying Value [Member] |  |  |
AFS securities: |  |  |
AFS Fixed Maturity Securities |  | 93,767 | 89,013
Fixed maturity AFS securities [Member] | Fair Value [Member] |  |  |
AFS securities: |  |  |
AFS Fixed Maturity Securities |  | 93,767 | 89,013
Other assets [Member] | Carrying Value [Member] |  |  |
AFS securities: |  |  |
Other assets - GLB direct embedded derivatives |  | 570 |
Other assets - GLB ceded embedded derivatives |  | 53 | 203
Indexed annuity ceded embedded derivatives |  | 3 |
Other assets [Member] | Fair Value [Member] |  |  |
AFS securities: |  |  |
Other assets - GLB direct embedded derivatives |  | 570 |
Other assets - GLB ceded embedded derivatives |  | 53 | 203
Indexed annuity ceded embedded derivatives |  | 3 |
Other liabilities [Member] | Carrying Value [Member] |  |  |
Other contract holder funds: |  |  |
Other liabilities - derivative liabilities | [1] | (213) | (553)
Other liabilities [Member] | Fair Value [Member] |  |  |
Other contract holder funds: |  |  |
Other liabilities - derivative liabilities | [1] | (213) | (553)
Other liabilities [Member] | GLB direct embedded derivatives [Member] | Carrying Value [Member] |  |  |
Other contract holder funds: |  |  |
Other liabilities - GLB embedded derivatives |  |  | (371)
Other liabilities [Member] | GLB direct embedded derivatives [Member] | Fair Value [Member] |  |  |
Other contract holder funds: |  |  |
Other liabilities - GLB embedded derivatives |  |  | $ (371)
Other liabilities [Member] | GLB ceded embedded derivatives [Member] | Carrying Value [Member] |  |  |
Other contract holder funds: |  |  |
Other liabilities - GLB embedded derivatives |  | (7) |
Other liabilities [Member] | GLB ceded embedded derivatives [Member] | Fair Value [Member] |  |  |
Other contract holder funds: |  |  |
Other liabilities - GLB embedded derivatives |  | $ (7) |
[1] | We have master netting agreements with each of our derivative counterparties, which allow for the netting of our derivative asset and liability positions by counterparty.

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- Definition Amount of equity securities categorized neither as held-to-maturity nor as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 + Details
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