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Condensed Financial Information of Parent Company - Condensed Statement of Cash Flows (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Activities: |  |  |  |  |  |  |  |  |  |  |
Net earnings attributable to shareholders | $ 166 | $ 11 | $ 145 | $ 153 | $ 385 | $ 109 | $ 54 | $ 101 | $ 475 | $ 649 | $ 352
Adjustments: |  |  |  |  |  |  |  |  |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 1,804 | 1,150 | 1,353
Investing Activities: |  |  |  |  |  |  |  |  |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (3,292) | (2,981) | (4,573)
Financing Activities: |  |  |  |  |  |  |  |  |  |  |
Additional long-term borrowings |  |  |  |  |  |  |  |  | 712 | 302 | 145
Reductions of long-term debt |  |  |  |  |  |  |  |  | (745) | (18) | (192)
Issuances of Common Stock |  |  |  |  |  |  |  |  | 37 | 35 | 61
Repurchases of Common Stock |  |  |  |  |  |  |  |  | 0 | (133) | (126)
Cash dividends paid on Common Stock |  |  |  |  |  |  |  |  | (417) | (185) | (176)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 1,719 | 2,718 | 3,097
Net Change in Cash and Cash Equivalents |  |  |  |  |  |  |  |  | 231 | 887 | (123)
Cash and cash equivalents at beginning of year |  |  |  | 2,107 |  |  |  | 1,220 | 2,107 | 1,220 | 1,343
Cash and cash equivalents at end of year | 2,338 |  |  |  | 2,107 |  |  |  | 2,338 | 2,107 | 1,220
AFG |  |  |  |  |  |  |  |  |  |  |
Operating Activities: |  |  |  |  |  |  |  |  |  |  |
Net earnings attributable to shareholders |  |  |  |  |  |  |  |  | 475 | 649 | 352
Adjustments: |  |  |  |  |  |  |  |  |  |  |
Equity in net earnings of subsidiaries |  |  |  |  |  |  |  |  | (575) | (638) | (451)
Dividends from subsidiaries |  |  |  |  |  |  |  |  | 580 | 611 | 280
Other operating activities, net |  |  |  |  |  |  |  |  | 98 | (67) | (19)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 578 | 555 | 162
Investing Activities: |  |  |  |  |  |  |  |  |  |  |
Capital contributions to subsidiaries |  |  |  |  |  |  |  |  | (93) | (560) | (27)
Returns of capital from subsidiaries |  |  |  |  |  |  |  |  | 30 | 0 | 1
Purchases of investments, property and equipment |  |  |  |  |  |  |  |  | (2) | (1) | (10)
Proceeds from maturities and redemptions of investments |  |  |  |  |  |  |  |  | 2 | 1 | 0
Proceeds from sales of investments, property and equipment |  |  |  |  |  |  |  |  | 0 | 0 | 3
Net cash used in investing activities |  |  |  |  |  |  |  |  | (63) | (560) | (33)
Financing Activities: |  |  |  |  |  |  |  |  |  |  |
Additional long-term borrowings |  |  |  |  |  |  |  |  | 712 | 296 | 145
Reductions of long-term debt |  |  |  |  |  |  |  |  | (745) | 0 | (132)
Issuances of Common Stock |  |  |  |  |  |  |  |  | 37 | 35 | 57
Repurchases of Common Stock |  |  |  |  |  |  |  |  | 0 | (133) | (126)
Cash dividends paid on Common Stock |  |  |  |  |  |  |  |  | (417) | (185) | (176)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | (413) | 13 | (232)
Net Change in Cash and Cash Equivalents |  |  |  |  |  |  |  |  | 102 | 8 | (103)
Cash and cash equivalents at beginning of year |  |  |  | $ 197 |  |  |  | $ 189 | 197 | 189 | 292
Cash and cash equivalents at end of year | $ 299 |  |  |  | $ 197 |  |  |  | $ 299 | $ 197 | $ 189

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