|
Investment Income and Gains and Losses - Realized Investment Gains and Losses (Details) (USD $)
In Millions, unless otherwise specified
|
3 Months Ended |
|
Mar. 31, 2015
|
Mar. 31, 2014
|
| Realized Gains (Losses) on Investments [Line Items] |
|
|
|
|
| Realized investment gains (losses) before income taxes |
$ 73 |
|
$ 42 |
|
| Less income taxes (benefits) |
25 |
|
15 |
|
| Net realized investment gains (losses) |
48 |
|
27 |
|
| Impairments Table Details [Abstract] |
|
|
|
|
| Credit-related |
(6) |
[1] |
(6) |
[1] |
| Other |
(5) |
|
0 |
|
| Total |
(11) |
|
(6) |
|
| Sales Information For Available For Sale Fixed Maturities Equity Securities [Abstract] |
|
|
|
|
| Proceeds from sales |
393 |
|
194 |
|
| Gross gains on sales |
27 |
|
22 |
|
| Gross losses on sales |
2 |
|
0 |
|
| Fixed Maturities [Member] |
|
|
|
|
| Realized Gains (Losses) on Investments [Line Items] |
|
|
|
|
| Realized investment gains (losses) before income taxes |
7 |
|
8 |
|
| Equity securities [Member] |
|
|
|
|
| Realized Gains (Losses) on Investments [Line Items] |
|
|
|
|
| Realized investment gains (losses) before income taxes |
13 |
|
17 |
|
| Commercial Mortgage Loans [Member] |
|
|
|
|
| Realized Gains (Losses) on Investments [Line Items] |
|
|
|
|
| Realized investment gains (losses) before income taxes |
5 |
|
0 |
|
| Other Investments Including Derivatives [Member] |
|
|
|
|
| Realized Gains (Losses) on Investments [Line Items] |
|
|
|
|
| Realized investment gains (losses) before income taxes |
$ 48 |
|
$ 17 |
|
|
|
|