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Fair Value Measurements - The carrying value and fair value of financial instruments (Details) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Financial assets:
Mortgage loans		$ 1,125	$ 1,147
Policy loans		184	192
Financial liabilities:
Long-term debt		1,301	1,283
Level 1
Financial assets:
Cash and cash equivalents		2,338	2,107
Mortgage loans		0	0
Policy loans		0	0
Total financial assets not accounted for at fair value		2,338	2,107
Financial liabilities:
Annuity benefits accumulated	[1]	0	0
Long-term debt		0	0
Total financial liabilities not accounted for at fair value		0	0
Level 2
Financial assets:
Cash and cash equivalents		0	0
Mortgage loans		0	0
Policy loans		0	0
Total financial assets not accounted for at fair value		0	0
Financial liabilities:
Annuity benefits accumulated	[1]	0	0
Long-term debt		1,351	1,353
Total financial liabilities not accounted for at fair value		1,351	1,353
Level 3
Financial assets:
Cash and cash equivalents		0	0
Mortgage loans		1,119	1,146
Policy loans		184	192
Total financial assets not accounted for at fair value		1,303	1,338
Financial liabilities:
Annuity benefits accumulated	[1]	32,461	28,932
Long-term debt		3	3
Total financial liabilities not accounted for at fair value		32,464	28,935
Carrying Value
Financial assets:
Cash and cash equivalents		2,338	2,107
Mortgage loans		1,125	1,147
Policy loans		184	192
Total financial assets not accounted for at fair value		3,647	3,446
Financial liabilities:
Annuity benefits accumulated	[1]	33,110	29,703
Long-term debt		1,301	1,284
Total financial liabilities not accounted for at fair value		34,411	30,987
Fair Value
Financial assets:
Cash and cash equivalents		2,338	2,107
Mortgage loans		1,119	1,146
Policy loans		184	192
Total financial assets not accounted for at fair value		3,641	3,445
Financial liabilities:
Annuity benefits accumulated	[1]	32,461	28,932
Long-term debt		1,354	1,356
Total financial liabilities not accounted for at fair value		$ 33,815	$ 30,288
[1] Excludes $206 million and $204 million of life contingent annuities in the payout phase at December 31, 2017 and 2016, respectively.

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Annuity Benefits Accumulated Excluding Life Contingent Annuities.

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Total financial assets not accounted for at fair value.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount before allowance of loans made to policy and contract holders using their life insurance contracts' cash value or separate accounts as collateral. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums over and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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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.

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