|
Fair Value Measurements (Financial Instruments Measured At Fair Value On Recurring Basis) (Detail) (USD $)
In Millions, unless otherwise specified
|
Sep. 30, 2014
|
Dec. 31, 2013
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
|
|
| Fixed maturities available for sale at fair value |
$ 49,148 |
|
$ 49,254 |
|
| Equity securities, at fair value |
546 |
|
837 |
|
| Short-term investments |
2,753 |
|
1,763 |
|
| Other investments |
3,259 |
|
2,976 |
|
| Securities lending collateral |
1,440 |
|
1,632 |
|
|
Fair Value, Inputs, Level 1 [Member]
|
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
|
|
| Fixed maturities available for sale at fair value |
1,692 |
|
1,849 |
|
| Equity securities, at fair value |
520 |
|
373 |
|
| Short-term investments |
1,253 |
|
953 |
|
| Other investments |
336 |
|
305 |
|
| Investment derivative instruments, assets |
23 |
|
19 |
|
| Other derivative instruments, assets |
11 |
|
0 |
|
| Separate account assets |
1,389 |
|
1,145 |
|
| Total assets measured at fair value |
5,224 |
|
4,644 |
|
| Investment derivative instruments, liabilities |
5 |
|
6 |
|
| Other derivative instruments, liability |
0 |
|
60 |
|
| GLB |
0 |
[1] |
0 |
[1] |
| Total liabilities measured at fair value |
5 |
|
66 |
|
|
Fair Value, Inputs, Level 1 [Member] | U.S. Treasury And Agency [Member]
|
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
|
|
| Fixed maturities available for sale at fair value |
1,490 |
|
1,626 |
|
|
Fair Value, Inputs, Level 1 [Member] | Foreign [Member]
|
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
|
|
| Fixed maturities available for sale at fair value |
202 |
|
223 |
|
|
Fair Value, Inputs, Level 1 [Member] | Corporate Securities [Member]
|
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
|
|
| Fixed maturities available for sale at fair value |
0 |
|
0 |
|
|
Fair Value, Inputs, Level 2 [Member]
|
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
|
|
| Fixed maturities available for sale at fair value |
47,221 |
|
47,187 |
|
| Equity securities, at fair value |
24 |
|
460 |
|
| Short-term investments |
1,500 |
|
803 |
|
| Other investments |
252 |
|
231 |
|
| Securities lending collateral |
1,440 |
|
1,632 |
|
| Other derivative instruments, assets |
2 |
|
6 |
|
| Separate account assets |
90 |
|
81 |
|
| Total assets measured at fair value |
50,529 |
|
50,400 |
|
| Investment derivative instruments, liabilities |
0 |
|
0 |
|
| Other derivative instruments, liability |
2 |
|
2 |
|
| GLB |
0 |
[1] |
0 |
[1] |
| Total liabilities measured at fair value |
2 |
|
2 |
|
|
Fair Value, Inputs, Level 2 [Member] | U.S. Treasury And Agency [Member]
|
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
|
|
| Fixed maturities available for sale at fair value |
1,188 |
|
1,323 |
|
|
Fair Value, Inputs, Level 2 [Member] | Foreign [Member]
|
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
|
|
| Fixed maturities available for sale at fair value |
15,017 |
|
14,324 |
|
|
Fair Value, Inputs, Level 2 [Member] | Corporate Securities [Member]
|
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
|
|
| Fixed maturities available for sale at fair value |
17,130 |
|
17,304 |
|
|
Fair Value, Inputs, Level 2 [Member] | Mortgage Backed-Securities [Member]
|
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
|
|
| Fixed maturities available for sale at fair value |
10,309 |
|
10,886 |
|
|
Fair Value, Inputs, Level 2 [Member] | States, Municipalities, And Political Subdivisions [Member]
|
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
|
|
| Fixed maturities available for sale at fair value |
3,577 |
|
3,350 |
|
|
Fair Value, Inputs, Level 3 [Member]
|
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
|
|
| Fixed maturities available for sale at fair value |
235 |
|
218 |
|
| Equity securities, at fair value |
2 |
|
4 |
|
| Short-term investments |
0 |
|
7 |
|
| Other investments |
2,671 |
|
2,440 |
|
| Other derivative instruments, assets |
0 |
|
0 |
|
| Total assets measured at fair value |
2,908 |
|
2,669 |
|
| Investment derivative instruments, liabilities |
0 |
|
0 |
|
| Other derivative instruments, liability |
0 |
|
0 |
|
| GLB |
317 |
[1] |
193 |
[1] |
| Total liabilities measured at fair value |
317 |
|
193 |
|
|
Fair Value, Inputs, Level 3 [Member] | U.S. Treasury And Agency [Member]
|
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
|
|
| Fixed maturities available for sale at fair value |
0 |
|
0 |
|
|
Fair Value, Inputs, Level 3 [Member] | Foreign [Member]
|
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
|
|
| Fixed maturities available for sale at fair value |
12 |
|
44 |
|
|
Fair Value, Inputs, Level 3 [Member] | Corporate Securities [Member]
|
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
|
|
| Fixed maturities available for sale at fair value |
208 |
|
166 |
|
|
Fair Value, Inputs, Level 3 [Member] | Mortgage Backed-Securities [Member]
|
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
|
|
| Fixed maturities available for sale at fair value |
15 |
|
8 |
|
|
Fair Value, Inputs, Level 3 [Member] | States, Municipalities, And Political Subdivisions [Member]
|
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
|
|
| Fixed maturities available for sale at fair value |
0 |
|
0 |
|
|
Estimate of Fair Value, Fair Value Disclosure [Member]
|
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
|
|
| Fixed maturities available for sale at fair value |
49,148 |
|
49,254 |
|
| Equity securities, at fair value |
546 |
|
837 |
|
| Short-term investments |
2,753 |
|
1,763 |
|
| Other investments |
3,259 |
|
2,976 |
|
| Securities lending collateral |
1,440 |
|
1,632 |
|
| Investment derivative instruments, assets |
23 |
|
19 |
|
| Other derivative instruments, assets |
13 |
|
6 |
|
| Separate account assets |
1,479 |
|
1,226 |
|
| Total assets measured at fair value |
58,661 |
|
57,713 |
|
| Investment derivative instruments, liabilities |
5 |
|
6 |
|
| Other derivative instruments, liability |
2 |
|
62 |
|
| GLB |
317 |
[1] |
193 |
[1] |
| Total liabilities measured at fair value |
324 |
|
261 |
|
|
Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. Treasury And Agency [Member]
|
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
|
|
| Fixed maturities available for sale at fair value |
2,678 |
|
2,949 |
|
|
Estimate of Fair Value, Fair Value Disclosure [Member] | Foreign [Member]
|
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
|
|
| Fixed maturities available for sale at fair value |
15,231 |
|
14,591 |
|
|
Estimate of Fair Value, Fair Value Disclosure [Member] | Corporate Securities [Member]
|
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
|
|
| Fixed maturities available for sale at fair value |
17,338 |
|
17,470 |
|
|
Estimate of Fair Value, Fair Value Disclosure [Member] | Mortgage Backed-Securities [Member]
|
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
|
|
| Fixed maturities available for sale at fair value |
10,324 |
|
10,894 |
|
|
Estimate of Fair Value, Fair Value Disclosure [Member] | States, Municipalities, And Political Subdivisions [Member]
|
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |
|
|
|
|
| Fixed maturities available for sale at fair value |
$ 3,577 |
|
$ 3,350 |
|
|
|
|