Reserves for Insurance Losses and Loss Adjustment Expenses Reserves for Insurance Losses and Loss Adjustment Expenses (Schedule of Liability for Unpaid Claims and Claims Adjustment Expense) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
Liability for Claims and Claims Adjustment Expenses (Rollforward) [Abstract]
Liability for Claims and Claims Adjustment Expense	$ 169
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	120
Liability for Unpaid Claims and Claims Adjustment Expense, Net	49
Current Year Claims and Claims Adjustment Expense	345
Prior Year Claims and Claims Adjustment Expense	(3)
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims	342
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year	(320)
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	30
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid	(350)
Liability for Unpaid Claims and Claims Adjustment Expense, Net	41
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	108
Liability for Claims and Claims Adjustment Expense	$ 149