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Investments - Amortized cost, gross unrealized gains and losses and fair value for fixed income securities (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available for Sale Securities |  |
Amortized cost | $ 57,525 | $ 56,576
Gross unrealized gains | 1,750 | 1,710
Gross unrealized losses | (283) | (447)
Fixed income securities | 58,992 | 57,839
U.S. government and agencies |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 3,580 | 3,572
Gross unrealized gains | 56 | 74
Gross unrealized losses | (20) | (9)
Fixed income securities | 3,616 | 3,637
Municipal |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 8,053 | 7,116
Gross unrealized gains | 311 | 304
Gross unrealized losses | (36) | (87)
Fixed income securities | 8,328 | 7,333
Corporate |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 42,996 | 42,742
Gross unrealized gains | 1,234 | 1,178
Gross unrealized losses | (204) | (319)
Fixed income securities | 44,026 | 43,601
Foreign government |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 1,005 | 1,043
Gross unrealized gains | 27 | 36
Gross unrealized losses | (11) | (4)
Fixed income securities | 1,021 | 1,075
ABS |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 1,266 | 1,169
Gross unrealized gains | 13 | 13
Gross unrealized losses | (7) | (11)
Fixed income securities | 1,272 | 1,171
RMBS |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 480 | 651
Gross unrealized gains | 101 | 85
Gross unrealized losses | (3) | (8)
Fixed income securities | 578 | 728
CMBS |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 124 | 262
Gross unrealized gains | 6 | 17
Gross unrealized losses | (2) | (9)
Fixed income securities | 128 | 270
Redeemable preferred stock |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 21 | 21
Gross unrealized gains | 2 | 3
Gross unrealized losses | 0 | 0
Fixed income securities | $ 23 | $ 24

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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