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Fair Value of Assets and Liabilities (Details 5) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Financial assets |  |  |  |
Mortgage loans | $ 4,336 | $ 4,486 |  |
Financial liabilities |  |  |  |
Long-term debt | 6,348 | 6,347 |  |
Liability for collateral | 1,126 | 1,129 | $ 896 | $ 840
Carrying value |  |  |  |
Financial assets |  |  |  |
Mortgage loans | 4,336 | 4,486 |  |
Cost method limited partnerships | 1,269 | 1,282 |  |
Bank loans | 1,754 | 1,669 |  |
Agent loans | 499 | 467 |  |
Financial liabilities |  |  |  |
Contractholder funds on investment contracts | 10,846 | 11,313 |  |
Long-term debt | 6,348 | 6,347 |  |
Liability for collateral | 1,126 | 1,129 |  |
Fair value |  |  |  |
Financial assets |  |  |  |
Mortgage loans | 4,483 | 4,514 |  |
Cost method limited partnerships | 1,511 | 1,493 |  |
Bank loans | 1,759 | 1,677 |  |
Agent loans | 495 | 467 |  |
Financial liabilities |  |  |  |
Contractholder funds on investment contracts | 11,441 | 12,009 |  |
Long-term debt | 7,118 | 6,920 |  |
Liability for collateral | $ 1,126 | $ 1,129 |  |

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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75025870&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75027002&loc=d3e40346-111594 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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