Investments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Investments [Abstract]
Reduction of net unrealized gains on investments included in AOCI due to shadow adjustments	$ 937	$ 532
Future capital call commitments for limited partnership investments	348
Mortgage Loan Commitments	40
Commitments to purchase or fund privately placed debt securities	244
Commitments to sell various privately placed debt securities	$ 158