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Fair Value of Financial Instruments (Carrying and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
AFS securities: |  |  |
AFS Fixed Maturity Securities |  | $ 93,014 | $ 89,013
Variable interest entities' fixed maturity securities |  |  | 200
AFS Equity securities |  | 275 | 275
Trading securities |  | 1,678 | 1,712
Mortgage loans on real estate |  | 10,023 | 9,889
Derivative investments |  | 1,054 | 927
Other investments |  | 2,156 | 2,230
Carrying Value [Member] |  |  |
AFS securities: |  |  |
AFS Equity securities |  | 275 | 275
Trading securities |  | 1,678 | 1,712
Mortgage loans on real estate |  | 10,023 | 9,889
Derivative investments | [1] | 1,054 | 927
Other investments |  | 2,156 | 2,230
Cash and invested cash |  | 1,978 | 2,722
Other assets - GLB direct embedded derivatives | [2] | 298 |
Other assets - GLB ceded embedded derivatives |  | 85 | 203
Separate account assets |  | 135,825 | 128,397
Future contract benefits: |  |  |
Indexed annuity and IUL contracts embedded derivatives |  | (1,268) | (1,139)
Other contract holder funds: |  |  |
Remaining guaranteed interest and similar contracts |  | (625) | (629)
Account values of certain investment contracts |  | (31,982) | (31,516)
Short-term debt |  | (450) |
Long-term debt |  | (4,901) | (5,345)
Reinsurance related embedded derivatives |  | (53) | (53)
Other liabilities - derivative liabilities | [1] | (169) | (553)
Other liabilities - GLB direct embedded derivatives | [2] |  | (371)
Fair Value [Member] |  |  |
AFS securities: |  |  |
AFS Equity securities |  | 275 | 275
Trading securities |  | 1,678 | 1,712
Mortgage loans on real estate |  | 10,157 | 9,853
Derivative investments | [1] | 1,054 | 927
Other investments |  | 2,156 | 2,230
Cash and invested cash |  | 1,978 | 2,722
Other assets - GLB direct embedded derivatives | [2] | 298 |
Other assets - GLB ceded embedded derivatives |  | 85 | 203
Separate account assets |  | 135,825 | 128,397
Future contract benefits: |  |  |
Indexed annuity and IUL contracts embedded derivatives |  | (1,268) | (1,139)
Other contract holder funds: |  |  |
Remaining guaranteed interest and similar contracts |  | (625) | (629)
Account values of certain investment contracts |  | (36,201) | (35,647)
Short-term debt |  | (457) |
Long-term debt |  | (5,485) | (5,679)
Reinsurance related embedded derivatives |  | (53) | (53)
Other liabilities - derivative liabilities | [1] | (169) | (553)
Other liabilities - GLB direct embedded derivatives | [2] |  | (371)
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 |  | 93,014 | 89,013
Fixed maturity AFS securities [Member] | Fair Value [Member] |  |  |
AFS securities: |  |  |
AFS Fixed Maturity Securities |  | $ 93,014 | $ 89,013
[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.
[2] | Portions of our GLB direct embedded derivatives are ceded to third-party reinsurance counterparties. Refer to Note 5 for additional detail.

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