Related Party Transactions (Effects of Affiliated Reinsurance on Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Assets:
Premiums, reinsurance and other receivables	$ 21,497	$ 22,143
Deferred policy acquisition costs and value of business acquired	4,475	3,793
Liabilities:
Other policy-related balances	3,141	3,138
Other Liabilities	6,238	6,547
Assumed Reinsurance [Member] | Affiliated Entity [Member]
Assets:
Premiums, reinsurance and other receivables	32	35
Deferred policy acquisition costs and value of business acquired	137	121
Total assets	169	156
Liabilities:
Other policy-related balances	1,641	1,592
Other Liabilities	9	10
Total liabilities	1,650	1,602
Ceded Reinsurance [Member] | Affiliated Entity [Member]
Assets:
Premiums, reinsurance and other receivables	12,942	14,171
Deferred policy acquisition costs and value of business acquired	(684)	(642)
Total assets	12,258	13,529
Liabilities:
Other policy-related balances	820	855
Other Liabilities	4,550	4,894
Total liabilities	$ 5,370	$ 5,749