Derivatives and Hedging Activities Derivatives and Hedging Activites (Option Pay/Rec) (Details 4) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014
Summary of Option Premiums Payable and Receivable
Premiums payable	$ 1,940
Premiums receivable	453
Current Year [Member]
Summary of Option Premiums Payable and Receivable
Premiums payable	111	[1]
Premiums receivable	49	[1]
2015 [Member]
Summary of Option Premiums Payable and Receivable
Premiums payable	369
Premiums receivable	71
2016 [Member]
Summary of Option Premiums Payable and Receivable
Premiums payable	336
Premiums receivable	55
2017 [Member]
Summary of Option Premiums Payable and Receivable
Premiums payable	260
Premiums receivable	70
2018 [Member]
Summary of Option Premiums Payable and Receivable
Premiums payable	209
Premiums receivable	70
2019-2027 [Member]
Summary of Option Premiums Payable and Receivable
Premiums payable	655
Premiums receivable	$ 138

[1] 2014 amounts represent the amounts payable and receivable for the period from October 1, 2014 to December 31, 2014.