Fair Value (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	$ 8,429	$ 8,137
Total
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	10,764
Level 1
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	2,547
Level 2
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	8,146
Level 3
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	71
Fair value measurements on a recurring basis | Total
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	10,764	10,471
Fair value measurements on a recurring basis | Level 1
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	2,547	2,548
Fair value measurements on a recurring basis | Level 2
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	8,146	7,845
Fair value measurements on a recurring basis | Level 3
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	71	78
Indemnity
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	573	288
Indemnity | Total
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	600
Indemnity | Total | Fixed maturities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	548
Indemnity | Total | Common stock
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	27
Indemnity | Level 1
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	37
Indemnity | Level 1 | Fixed maturities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	0
Indemnity | Level 1 | Common stock
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	27
Indemnity | Level 2
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	559
Indemnity | Level 2 | Fixed maturities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	544
Indemnity | Level 2 | Common stock
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	0
Indemnity | Level 3
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	4
Indemnity | Level 3 | Fixed maturities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	4
Indemnity | Level 3 | Common stock
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	0
Indemnity | Fair value measurements on a recurring basis | Total
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	573	288
Trading securities	27	28
Total available-for-sale securities and trading securities	600	316
Indemnity | Fair value measurements on a recurring basis | Total | Fixed maturities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	548	264
Indemnity | Fair value measurements on a recurring basis | Total | U.S. government & agencies
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities		25
Indemnity | Fair value measurements on a recurring basis | Total | States & political subdivisions
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	221	197
Indemnity | Fair value measurements on a recurring basis | Total | Corporate debt securities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	303	38
Indemnity | Fair value measurements on a recurring basis | Total | Other debt securities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	7
Indemnity | Fair value measurements on a recurring basis | Total | Commercial mortgage-backed securities (CMBS)
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	13
Indemnity | Fair value measurements on a recurring basis | Total | Collateralized debt obligations (CDO)
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	4	4
Indemnity | Fair value measurements on a recurring basis | Total | Nonredeemable preferred stock
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	25	24
Indemnity | Fair value measurements on a recurring basis | Total | Common stock
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Trading securities	27	28
Indemnity | Fair value measurements on a recurring basis | Level 1
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	10	36
Trading securities	27	28
Total available-for-sale securities and trading securities	37	64
Indemnity | Fair value measurements on a recurring basis | Level 1 | Fixed maturities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	0	25
Indemnity | Fair value measurements on a recurring basis | Level 1 | U.S. government & agencies
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities		25
Indemnity | Fair value measurements on a recurring basis | Level 1 | States & political subdivisions
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	0	0
Indemnity | Fair value measurements on a recurring basis | Level 1 | Corporate debt securities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	0	0
Indemnity | Fair value measurements on a recurring basis | Level 1 | Other debt securities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	0
Indemnity | Fair value measurements on a recurring basis | Level 1 | Commercial mortgage-backed securities (CMBS)
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	0
Indemnity | Fair value measurements on a recurring basis | Level 1 | Collateralized debt obligations (CDO)
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	0	0
Indemnity | Fair value measurements on a recurring basis | Level 1 | Nonredeemable preferred stock
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	10	11
Indemnity | Fair value measurements on a recurring basis | Level 1 | Common stock
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Trading securities	27	28
Indemnity | Fair value measurements on a recurring basis | Level 2
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	559	248
Trading securities	0	0
Total available-for-sale securities and trading securities	559	248
Indemnity | Fair value measurements on a recurring basis | Level 2 | Fixed maturities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	544	235
Indemnity | Fair value measurements on a recurring basis | Level 2 | U.S. government & agencies
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities		0
Indemnity | Fair value measurements on a recurring basis | Level 2 | States & political subdivisions
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	221	197
Indemnity | Fair value measurements on a recurring basis | Level 2 | Corporate debt securities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	303	38
Indemnity | Fair value measurements on a recurring basis | Level 2 | Other debt securities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	7
Indemnity | Fair value measurements on a recurring basis | Level 2 | Commercial mortgage-backed securities (CMBS)
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	13
Indemnity | Fair value measurements on a recurring basis | Level 2 | Collateralized debt obligations (CDO)
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	0	0
Indemnity | Fair value measurements on a recurring basis | Level 2 | Nonredeemable preferred stock
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	15	13
Indemnity | Fair value measurements on a recurring basis | Level 2 | Common stock
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Trading securities	0	0
Indemnity | Fair value measurements on a recurring basis | Level 3
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	4	4
Trading securities	0	0
Total available-for-sale securities and trading securities	4	4
Indemnity | Fair value measurements on a recurring basis | Level 3 | Fixed maturities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	4	4
Indemnity | Fair value measurements on a recurring basis | Level 3 | U.S. government & agencies
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities		0
Indemnity | Fair value measurements on a recurring basis | Level 3 | States & political subdivisions
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	0	0
Indemnity | Fair value measurements on a recurring basis | Level 3 | Corporate debt securities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	0	0
Indemnity | Fair value measurements on a recurring basis | Level 3 | Other debt securities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	0
Indemnity | Fair value measurements on a recurring basis | Level 3 | Commercial mortgage-backed securities (CMBS)
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	0
Indemnity | Fair value measurements on a recurring basis | Level 3 | Collateralized debt obligations (CDO)
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	4	4
Indemnity | Fair value measurements on a recurring basis | Level 3 | Nonredeemable preferred stock
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	0	0
Indemnity | Fair value measurements on a recurring basis | Level 3 | Common stock
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities		0
Trading securities	0	0
Total available-for-sale securities and trading securities		0
Exchange
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	7,856	7,849
Exchange | Total
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	10,164
Exchange | Total | Fixed maturities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	7,292
Exchange | Total | Common stock
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	2,308
Exchange | Level 1
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	2,510
Exchange | Level 1 | Fixed maturities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	26
Exchange | Level 1 | Common stock
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	2,296
Exchange | Level 2
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	7,587
Exchange | Level 2 | Fixed maturities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	7,216
Exchange | Level 2 | Common stock
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	0
Exchange | Level 3
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	67
Exchange | Level 3 | Fixed maturities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	50
Exchange | Level 3 | Common stock
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Total available-for-sale securities and trading securities	12
Exchange | Fair value measurements on a recurring basis | Total
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	7,856	7,849
Trading securities	2,308	2,306
Total available-for-sale securities and trading securities	10,164	10,155
Exchange | Fair value measurements on a recurring basis | Total | Fixed maturities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	7,292	7,279
Exchange | Fair value measurements on a recurring basis | Total | U.S. government & agencies
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	17	87
Exchange | Fair value measurements on a recurring basis | Total | States & political subdivisions
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	1,379	1,471
Exchange | Fair value measurements on a recurring basis | Total | Foreign government securities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	15	21
Exchange | Fair value measurements on a recurring basis | Total | Corporate debt securities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	5,499	5,263
Exchange | Fair value measurements on a recurring basis | Total | Other debt securities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	62	57
Exchange | Fair value measurements on a recurring basis | Total | Residential mortgage-backed securities (RMBS)
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	189	224
Exchange | Fair value measurements on a recurring basis | Total | Commercial mortgage-backed securities (CMBS)
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	66	86
Exchange | Fair value measurements on a recurring basis | Total | Collateralized debt obligations (CDO)
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	65	70
Exchange | Fair value measurements on a recurring basis | Total | Nonredeemable preferred stock
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	564	570
Exchange | Fair value measurements on a recurring basis | Total | Common stock
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Trading securities	2,308	2,306
Exchange | Fair value measurements on a recurring basis | Level 1
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	214	190
Trading securities	2,296	2,294
Total available-for-sale securities and trading securities	2,510	2,484
Exchange | Fair value measurements on a recurring basis | Level 1 | Fixed maturities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	26	24
Exchange | Fair value measurements on a recurring basis | Level 1 | U.S. government & agencies
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	6	12
Exchange | Fair value measurements on a recurring basis | Level 1 | States & political subdivisions
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	0	0
Exchange | Fair value measurements on a recurring basis | Level 1 | Foreign government securities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	0	0
Exchange | Fair value measurements on a recurring basis | Level 1 | Corporate debt securities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	20	12
Exchange | Fair value measurements on a recurring basis | Level 1 | Other debt securities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	0	0
Exchange | Fair value measurements on a recurring basis | Level 1 | Residential mortgage-backed securities (RMBS)
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	0	0
Exchange | Fair value measurements on a recurring basis | Level 1 | Commercial mortgage-backed securities (CMBS)
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	0	0
Exchange | Fair value measurements on a recurring basis | Level 1 | Collateralized debt obligations (CDO)
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	0	0
Exchange | Fair value measurements on a recurring basis | Level 1 | Nonredeemable preferred stock
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	188	166
Exchange | Fair value measurements on a recurring basis | Level 1 | Common stock
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Trading securities	2,296	2,294
Exchange | Fair value measurements on a recurring basis | Level 2
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	7,587	7,597
Trading securities	0	0
Total available-for-sale securities and trading securities	7,587	7,597
Exchange | Fair value measurements on a recurring basis | Level 2 | Fixed maturities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	7,216	7,200
Exchange | Fair value measurements on a recurring basis | Level 2 | U.S. government & agencies
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	11	75
Exchange | Fair value measurements on a recurring basis | Level 2 | States & political subdivisions
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	1,375	1,467
Exchange | Fair value measurements on a recurring basis | Level 2 | Foreign government securities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	15	21
Exchange | Fair value measurements on a recurring basis | Level 2 | Corporate debt securities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	5,467	5,240
Exchange | Fair value measurements on a recurring basis | Level 2 | Other debt securities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	57	47
Exchange | Fair value measurements on a recurring basis | Level 2 | Residential mortgage-backed securities (RMBS)
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	189	224
Exchange | Fair value measurements on a recurring basis | Level 2 | Commercial mortgage-backed securities (CMBS)
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	66	86
Exchange | Fair value measurements on a recurring basis | Level 2 | Collateralized debt obligations (CDO)
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	36	40
Exchange | Fair value measurements on a recurring basis | Level 2 | Nonredeemable preferred stock
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	371	397
Exchange | Fair value measurements on a recurring basis | Level 2 | Common stock
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Trading securities	0	0
Exchange | Fair value measurements on a recurring basis | Level 3
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	55	62
Trading securities	12	12
Total available-for-sale securities and trading securities	67	74
Exchange | Fair value measurements on a recurring basis | Level 3 | Fixed maturities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	50	55
Exchange | Fair value measurements on a recurring basis | Level 3 | U.S. government & agencies
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	0	0
Exchange | Fair value measurements on a recurring basis | Level 3 | States & political subdivisions
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	4	4
Exchange | Fair value measurements on a recurring basis | Level 3 | Foreign government securities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	0	0
Exchange | Fair value measurements on a recurring basis | Level 3 | Corporate debt securities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	12	11
Exchange | Fair value measurements on a recurring basis | Level 3 | Other debt securities
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	5	10
Exchange | Fair value measurements on a recurring basis | Level 3 | Residential mortgage-backed securities (RMBS)
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	0	0
Exchange | Fair value measurements on a recurring basis | Level 3 | Commercial mortgage-backed securities (CMBS)
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	0	0
Exchange | Fair value measurements on a recurring basis | Level 3 | Collateralized debt obligations (CDO)
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	29	30
Exchange | Fair value measurements on a recurring basis | Level 3 | Nonredeemable preferred stock
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Available-for-sale securities	5	7
Exchange | Fair value measurements on a recurring basis | Level 3 | Common stock
Fair value measurements on a recurring basis for consolidated available-for-sale and trading securities by asset class and level of input
Trading securities	$ 12	$ 12