Segment Information (Reconciliation of Amortization of DAC and VOBA, Net of Interest from Segments to Consolidated Net Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Amortization of DAC and VOBA, Net of Interest
Amortization of DAC and VOBA, net of interest	$ 931	$ 1,026	$ 846
Annuities [Member]
Amortization of DAC and VOBA, Net of Interest
Amortization of DAC and VOBA, net of interest	383	321	351
Retirement Plan Services [Member]
Amortization of DAC and VOBA, Net of Interest
Amortization of DAC and VOBA, net of interest	48	42	33
Life Insurance [Member]
Amortization of DAC and VOBA, Net of Interest
Amortization of DAC and VOBA, net of interest	447	614	423
Group Protection [Member]
Amortization of DAC and VOBA, Net of Interest
Amortization of DAC and VOBA, net of interest	$ 53	$ 49	$ 39