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Derivative Financial Instruments (Schedule of Pre-Tax Impact of Items Designated as Fair Value Hedges) (Details) - Fair Value Hedging - Designated as Hedging Instrument - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative [Line Items]        
Total in other expense, net $ 0   $ 0 $ 0
Equity Contract        
Derivative [Line Items]        
Gains on changes in fair value of hedged AFS   $ 4,000,000   4,000,000
Gains on changes in the intrinsic value of equity contracts   (4,000,000)   (4,000,000)
Fair value of equity contracts excluded from effectiveness assessment   3,000,000   1,000,000
Equity Contract | Other expense, net        
Derivative [Line Items]        
Total in other expense, net   $ 3,000,000   $ 1,000,000