Derivatives (Primary Risks) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Derivatives Designated as Hedging Instruments [Member]	Dec. 31, 2012 Derivatives Designated as Hedging Instruments [Member]	Dec. 31, 2013 Derivatives Designated as Hedging Instruments [Member] Fair Value Hedges [Member]	Dec. 31, 2012 Derivatives Designated as Hedging Instruments [Member] Fair Value Hedges [Member]	Dec. 31, 2013 Derivatives Designated as Hedging Instruments [Member] Fair Value Hedges [Member] Interest rate swaps [Member]	Dec. 31, 2012 Derivatives Designated as Hedging Instruments [Member] Fair Value Hedges [Member] Interest rate swaps [Member]	Dec. 31, 2013 Derivatives Designated as Hedging Instruments [Member] Fair Value Hedges [Member] Foreign currency swaps [Member]	Dec. 31, 2012 Derivatives Designated as Hedging Instruments [Member] Fair Value Hedges [Member] Foreign currency swaps [Member]	Dec. 31, 2013 Derivatives Designated as Hedging Instruments [Member] Fair Value Hedges [Member] Foreign currency forwards [Member]	Dec. 31, 2012 Derivatives Designated as Hedging Instruments [Member] Fair Value Hedges [Member] Foreign currency forwards [Member]	Dec. 31, 2013 Derivatives Designated as Hedging Instruments [Member] Cash Flow Hedges [Member]	Dec. 31, 2012 Derivatives Designated as Hedging Instruments [Member] Cash Flow Hedges [Member]	Dec. 31, 2013 Derivatives Designated as Hedging Instruments [Member] Cash Flow Hedges [Member] Interest rate swaps [Member]	Dec. 31, 2012 Derivatives Designated as Hedging Instruments [Member] Cash Flow Hedges [Member] Interest rate swaps [Member]	Dec. 31, 2013 Derivatives Designated as Hedging Instruments [Member] Cash Flow Hedges [Member] Interest rate forwards [Member]	Dec. 31, 2012 Derivatives Designated as Hedging Instruments [Member] Cash Flow Hedges [Member] Interest rate forwards [Member]	Dec. 31, 2013 Derivatives Designated as Hedging Instruments [Member] Cash Flow Hedges [Member] Foreign currency swaps [Member]	Dec. 31, 2012 Derivatives Designated as Hedging Instruments [Member] Cash Flow Hedges [Member] Foreign currency swaps [Member]	Dec. 31, 2013 Derivatives Designated as Hedging Instruments [Member] Foreign Operations Hedges [Member]	Dec. 31, 2012 Derivatives Designated as Hedging Instruments [Member] Foreign Operations Hedges [Member]	Dec. 31, 2013 Derivatives Designated as Hedging Instruments [Member] Foreign Operations Hedges [Member] Foreign currency forwards [Member]	Dec. 31, 2012 Derivatives Designated as Hedging Instruments [Member] Foreign Operations Hedges [Member] Foreign currency forwards [Member]	Dec. 31, 2013 Derivatives Designated as Hedging Instruments [Member] Foreign Operations Hedges [Member] Currency options [Member]	Mar. 31, 2011 Derivatives Designated as Hedging Instruments [Member] Foreign Operations Hedges [Member] Currency options [Member]	Dec. 31, 2013 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member]	Dec. 31, 2012 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member]	Dec. 31, 2013 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Interest rate swaps [Member]	Dec. 31, 2012 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Interest rate swaps [Member]	Dec. 31, 2013 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Interest rate floors [Member]	Dec. 31, 2012 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Interest rate floors [Member]	Dec. 31, 2013 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Interest rate caps [Member]	Dec. 31, 2012 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Interest rate caps [Member]	Dec. 31, 2013 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Interest rate futures [Member]	Dec. 31, 2012 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Interest rate futures [Member]	Dec. 31, 2013 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Interest rate options [Member]	Dec. 31, 2012 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Interest rate options [Member]	Dec. 31, 2013 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Synthetic GICs [Member]	Dec. 31, 2012 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Synthetic GICs [Member]	Dec. 31, 2013 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Foreign currency swaps [Member]	Dec. 31, 2012 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Foreign currency swaps [Member]	Dec. 31, 2013 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Foreign currency forwards [Member]	Dec. 31, 2012 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Foreign currency forwards [Member]	Dec. 31, 2013 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Currency futures [Member]	Dec. 31, 2012 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Currency futures [Member]	Dec. 31, 2013 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Currency options [Member]	Dec. 31, 2012 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Currency options [Member]	Dec. 31, 2013 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Credit default swaps - purchased [Member]	Dec. 31, 2012 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Credit default swaps - purchased [Member]	Dec. 31, 2013 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Credit default swaps - written [Member]	Dec. 31, 2012 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Credit default swaps - written [Member]	Dec. 31, 2013 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Equity futures [Member]	Dec. 31, 2012 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Equity futures [Member]	Dec. 31, 2013 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Equity Options [Member]	Dec. 31, 2012 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Equity Options [Member]	Dec. 31, 2013 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Variance swaps [Member]	Dec. 31, 2012 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Variance swaps [Member]	Dec. 31, 2013 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Total rate of return swaps [Member]	Dec. 31, 2012 Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] Total rate of return swaps [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	$ 404,895	$ 334,351	$ 38,634	$ 28,866	$ 12,067	$ 8,584	$ 6,419	$ 5,397	$ 2,713	$ 3,187	$ 2,935	$ 0	$ 16,023	$ 13,355	$ 3,121	$ 3,642	$ 450	$ 675	$ 12,452	$ 9,038	$ 10,544	$ 6,927	$ 3,182	$ 2,552	$ 7,362	$ 4,375	$ 366,261	$ 305,485	$ 107,354	$ 83,250	$ 63,064	$ 56,246	$ 39,460	$ 49,465	$ 6,011	$ 11,684	$ 40,978	$ 16,328	$ 4,409	$ 4,162	$ 9,307	$ 8,208	$ 11,311	$ 9,202	$ 1,316	$ 1,408	$ 2,265	$ 129	$ 3,725	$ 3,674	$ 9,055	$ 8,879	$ 5,157	$ 7,008	$ 37,411	$ 22,920	$ 21,636	$ 19,830	$ 3,802	$ 3,092
Estimated Fair Value Assets	8,595	13,777	2,425	3,402	1,534	2,253	1,282	1,921	252	332	0	0	491	1,063	83	705	7	139	401	219	400	86	82	43	318	43	6,170	10,375	3,330	5,201	451	1,174	177	74	9	1	255	640	0	0	133	199	69	26	1	4	53	1	7	11	166	79	1	14	1,344	2,825	174	122	0	4
Estimated Fair Value Liabilities	$ 6,521	$ 5,536	$ 1,145	$ 594	$ 290	$ 175	$ 78	$ 90	$ 135	$ 85	$ 77	$ 0	$ 808	$ 355	$ 141	$ 0	$ 7	$ 0	$ 660	$ 355	$ 47	$ 64	$ 47	$ 61	$ 0	$ 3	$ 5,376	$ 4,942	$ 1,767	$ 2,043	$ 346	$ 837	$ 0	$ 0	$ 9	$ 38	$ 243	$ 60	$ 0	$ 0	$ 684	$ 736	$ 359	$ 288	$ 1	$ 0	$ 48	$ 0	$ 51	$ 34	$ 1	$ 5	$ 43	$ 132	$ 1,068	$ 356	$ 577	$ 310	$ 179	$ 103