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Derivative Financial Instruments - Gains and losses from valuation and settlements reported on derivatives not designated as accounting hedges (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | $ (21) | $ 10
Realized capital gains (losses) |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (46) | (8)
Life contract benefits |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 8 | 4
Interest credited to contractholder funds |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (4) | 16
Operating costs and expenses |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 21 | (2)
Interest rate contracts |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 7 |
Interest rate contracts | Realized capital gains (losses) |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 7 |
Interest rate contracts | Life contract benefits |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 0 |
Interest rate contracts | Interest credited to contractholder funds |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 0 |
Interest rate contracts | Operating costs and expenses |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 0 |
Equity and index contracts |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (19) | (9)
Equity and index contracts | Realized capital gains (losses) |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (71) | (2)
Equity and index contracts | Life contract benefits |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 0 | 0
Equity and index contracts | Interest credited to contractholder funds |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 31 | (4)
Equity and index contracts | Operating costs and expenses |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 21 | (3)
Embedded derivative financial instruments |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (27) | 24
Embedded derivative financial instruments | Realized capital gains (losses) |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 0 | 0
Embedded derivative financial instruments | Life contract benefits |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 8 | 4
Embedded derivative financial instruments | Interest credited to contractholder funds |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (35) | 20
Embedded derivative financial instruments | Operating costs and expenses |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 0 | 0
Foreign currency contracts |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 5 | (6)
Foreign currency contracts | Realized capital gains (losses) |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 5 | (7)
Foreign currency contracts | Life contract benefits |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 0 | 0
Foreign currency contracts | Interest credited to contractholder funds |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 0 | 0
Foreign currency contracts | Operating costs and expenses |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 0 | 1
Credit default contracts |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (4) | 1
Credit default contracts | Realized capital gains (losses) |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | (4) | 1
Credit default contracts | Life contract benefits |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 0 | 0
Credit default contracts | Interest credited to contractholder funds |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 0 | 0
Credit default contracts | Operating costs and expenses |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 0 | $ 0
Total return swaps - fixed income |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 2 |
Total return swaps - fixed income | Realized capital gains (losses) |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 2 |
Total return swaps - fixed income | Life contract benefits |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 0 |
Total return swaps - fixed income | Interest credited to contractholder funds |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 0 |
Total return swaps - fixed income | Operating costs and expenses |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 0 |
Total return swaps - equity |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 15 |
Total return swaps - equity | Realized capital gains (losses) |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 15 |
Total return swaps - equity | Life contract benefits |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 0 |
Total return swaps - equity | Interest credited to contractholder funds |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | 0 |
Total return swaps - equity | Operating costs and expenses |  |
Derivative Instruments, Gain (Loss) |  |
Derivatives not designated as accounting hedging instruments, total gain (loss) recognized in net income on derivatives | $ 0 |

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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