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Deferred Policy Acquisition and Sales Inducement Costs (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deferred policy acquisition costs |  |  |
Balance, beginning of year | $ 3,954 | $ 3,861 | $ 3,525
Acquisition costs deferred | 5,001 | 4,717 | 4,596
Amortization charged to income | (4,784) | (4,550) | (4,364)
Effect of unrealized gains and losses | (46) | (74) | 104
Balance, end of year | 4,191 | 3,954 | 3,861
DSI activity relates to fixed annuities and interest-sensitive life contracts |  |  |
Balance, beginning of year | 40 | 45 | 44
Sales inducements deferred | 0 | 1 | 3
Amortization charged to income | (4) | (5) | (4)
Effect of unrealized gains and losses | 0 | (1) | 2
Balance, end of year | 36 | 40 | 45
SquareTrade |  |  |
Deferred policy acquisition costs |  |  |
Acquisition costs deferred | $ 66 | $ 0 | $ 0

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- Definition Deferred Policy Acquisition Costs, Amortization Charged to Income + References No definition available. + Details
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- Definition Represents the impact of unrealized capital gains and losses on the carrying amount of (a) capitalized costs that vary with and are primarily related to the acquisition of new and renewal insurance contracts and coverages, and (b) capitalized present value of future profits (also known as value of business acquired). + References No definition available. + Details
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- Definition Represents the amortization of deferred sales inducements charged to income. + References No definition available. + Details
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- Definition Amount of addition in deferred policy acquisition costs and present value of future profits from insurance contract acquired in business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section S99 -Paragraph 2 -Subparagraph (2) -URI http://asc.fasb.org/extlink&oid=27015749&loc=d3e569990-122904 + Details
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- Definition Amount, after accumulated amortization, of deferred policy acquisition costs and present value of future profits from insurance contract acquired in business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35755530&loc=d3e11264-158415 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.7) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section S99 -Paragraph 2 -Subparagraph (2) -URI http://asc.fasb.org/extlink&oid=27015749&loc=d3e569990-122904 + Details
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- Definition Amount of addition in deferred sales inducement cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6481800&loc=d3e11332-158416 + Details
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