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Reinsurance (Effects of Reinsurance on Earnings) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Premiums:      
Direct premiums $ 37,975 $ 37,044 $ 37,614
Reinsurance assumed 1,363 1,382 1,433
Reinsurance ceded (2,136) (2,023) (2,077)
Net premiums 37,202 36,403 36,970
Universal life and investment-type product policy fees:      
Direct universal life and investment-type product policy fees 5,883 5,952 6,271
Reinsurance assumed 96 105 19
Reinsurance ceded (497) (487) (466)
Net universal life and investment-type product policy fees 5,482 5,570 5,824
Policyholder benefits and claims:      
Direct policyholder benefits and claims 37,144 36,101 36,492
Reinsurance assumed 1,085 984 939
Reinsurance ceded (1,913) (1,983) (2,038)
Net policyholder benefits and claims 36,316 35,102 35,393
Other expenses:      
Direct other expenses 13,911 14,916 14,847
Reinsurance assumed 202 140 151
Reinsurance ceded (378) (303) (379)
Total other expenses $ 13,735 $ 14,753 $ 14,619