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Schedule II. Condensed Financial Information of Registrant (Parent Company) (Schedule of Condensed Financial Information of Registrant, Statements 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
Cash Flows from Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income | $ 223 | $ 144 | $ 272 | $ 260 | $ 241 | $ 343 | $ 209 | $ 66 | $ 899 | $ 859 | $ 479
Adjustments to reconcile net income to net cash flows provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Net realized investment losses (gains) |  |  |  |  |  |  |  |  | (93) | (50) | 67
Other, net |  |  |  |  |  |  |  |  | 38 | 29 | (2)
Total adjustments |  |  |  |  |  |  |  |  | 355 | 557 | 908
Net cash flows provided by operating activities |  |  |  |  |  |  |  |  | 1,254 | 1,416 | 1,387
Cash Flows from Investing Activities |  |  |  |  |  |  |  |  |  |  |
Change in short term investments |  |  |  |  |  |  |  |  | (6) | 258 | 34
Other, net |  |  |  |  |  |  |  |  | 20 | 2 | 21
Net cash flows used by investing activities |  |  |  |  |  |  |  |  | (424) | (846) | (372)
Cash Flows from Financing Activities |  |  |  |  |  |  |  |  |  |  |
Dividends paid to common stockholders |  |  |  |  |  |  |  |  | (842) | (813) | (811)
Proceeds from the issuance of debt |  |  |  |  |  |  |  |  | 496 | 498 | 0
Repayment of debt |  |  |  |  |  |  |  |  | (391) | (358) | 0
Other, net |  |  |  |  |  |  |  |  | (18) | 0 | 4
Net cash flows used by financing activities |  |  |  |  |  |  |  |  | (755) | (673) | (807)
Net change in cash |  |  |  |  |  |  |  |  | 84 | (116) | 197
Cash, beginning of year |  |  |  | 271 |  |  |  | 387 | 271 | 387 | 190
Cash, end of year | 355 |  |  |  | 271 |  |  |  | 355 | 271 | 387
Parent Company |  |  |  |  |  |  |  |  |  |  |
Cash Flows from Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 899 | 859 | 479
Adjustments to reconcile net income to net cash flows provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | (1,032) | (978) | (594)
Dividends received from subsidiaries |  |  |  |  |  |  |  |  | 955 | 765 | 900
Net realized investment losses (gains) |  |  |  |  |  |  |  |  | 42 | 7 | (5)
Other, net |  |  |  |  |  |  |  |  | 36 | 21 | 4
Total adjustments |  |  |  |  |  |  |  |  | 1 | (185) | 305
Net cash flows provided by operating activities |  |  |  |  |  |  |  |  | 900 | 674 | 784
Cash Flows from Investing Activities |  |  |  |  |  |  |  |  |  |  |
Change in short term investments |  |  |  |  |  |  |  |  | (146) | (9) | 21
Other, net |  |  |  |  |  |  |  |  | 0 | 4 | 7
Net cash flows used by investing activities |  |  |  |  |  |  |  |  | (146) | (5) | 28
Cash Flows from Financing Activities |  |  |  |  |  |  |  |  |  |  |
Dividends paid to common stockholders |  |  |  |  |  |  |  |  | (842) | (813) | (811)
Proceeds from the issuance of debt |  |  |  |  |  |  |  |  | 496 | 498 | 0
Repayment of debt |  |  |  |  |  |  |  |  | (391) | (358) | 0
Stock options exercised |  |  |  |  |  |  |  |  | 0 | 0 | 1
Other, net |  |  |  |  |  |  |  |  | (17) | 1 | 1
Net cash flows used by financing activities |  |  |  |  |  |  |  |  | (754) | (672) | (809)
Net change in cash |  |  |  |  |  |  |  |  | 0 | (3) | 3
Cash, beginning of year |  |  |  | $ 1 |  |  |  | $ 4 | 1 | 4 | 1
Cash, end of year | $ 1 |  |  |  | $ 1 |  |  |  | $ 1 | $ 1 | $ 4

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- Definition The net amount paid (received) by the reporting entity through acquisition (sale/maturities) of short-term investments with an original maturity that is less than 12 months which qualify for treatment as an investing activity based on management's intention and intended by management to be liquidated, if necessary, within the current operating cycle. + References No definition available. + Details
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