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Schedule IV - Reinsurance (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Life insurance in force |  |  |
Gross amount | $ 188,186 | $ 167,355 | $ 156,486
Ceded to other companies | 86,642 | 90,011 | 93,326
Assumed from other companies | 259,671 | 275,008 | 280,644
Net amount | $ 361,215 | $ 352,352 | $ 343,804
Percentage of amount assumed to net | 71.90% | 78.00% | 81.60%
Premiums and contract charges: |  |  |
Gross amount | $ 35,115 | $ 34,015 | $ 32,915
Ceded premium earned | 1,274 | 1,296 | 1,338
Assumed from other companies | 837 | 863 | 890
Net amount | $ 34,678 | $ 33,582 | $ 32,467
Percentage of amount assumed to net | 2.40% | 2.60% | 2.70%
Reinsurance or coinsurance income net of premium ceded | $ 0 | $ 0 | $ 0
Life insurance |  |  |
Premiums and contract charges: |  |  |
Gross amount | 936 | 877 | 828
Ceded premium earned | 276 | 279 | 299
Assumed from other companies | 787 | 818 | 849
Net amount | $ 1,447 | $ 1,416 | $ 1,378
Percentage of amount assumed to net | 54.40% | 57.80% | 61.60%
Accident and health insurance |  |  |
Premiums and contract charges: |  |  |
Gross amount | $ 958 | $ 889 | $ 813
Ceded premium earned | 27 | 30 | 33
Assumed from other companies | 0 | 0 | 0
Net amount | $ 931 | $ 859 | $ 780
Percentage of amount assumed to net | 0.00% | 0.00% | 0.00%
Property and casualty insurance |  |  |
Premiums and contract charges: |  |  |
Gross amount | $ 33,221 | $ 32,249 | $ 31,274
Ceded premium earned | 971 | 987 | 1,006
Assumed from other companies | 50 | 45 | 41
Net amount | $ 32,300 | $ 31,307 | $ 30,309
Percentage of amount assumed to net | 0.20% | 0.10% | 0.10%

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- Definition Amount of earned premiums assumed from other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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