Contingencies and Other Matters - Financial Guarantees (Details) (USD $)	Mar. 31, 2014
Market Value Guarantee [Member]
Guarantee Obligations [Line Items]
Guarantee Obligations, Maximum Exposure, Undiscounted	$ 41,000,000
Guarantee Obligations, Current Carrying Value	5,000,000
Market Value Guarantee [Member] | Expiring In 2016 [Member]
Guarantee Obligations [Line Items]
Guarantee Obligations, Maximum Exposure, Undiscounted	16,000,000
Market Value Guarantee [Member] | Expiring In 2025 [Member]
Guarantee Obligations [Line Items]
Guarantee Obligations, Maximum Exposure, Undiscounted	25,000,000
Indemnification Guarantee [Member]
Guarantee Obligations [Line Items]
Guarantee Obligations, Maximum Exposure, Undiscounted	313,000,000
Guarantee Obligations, Current Carrying Value	0
Guarantee Type, Other [Member] | Retirement And Life Insurance Contracts [Member]
Guarantee Obligations [Line Items]
Guarantee Obligations, Current Carrying Value	513,000,000
Separate Accounts Liability Sold Business Percent Reinsured	14.00%
Guarantee Type, Other [Member] | Variable Annuity [Member] | Guaranteed Minimum Income Benefit [Member]
Guarantee Obligations [Line Items]
Guarantee Obligations, Maximum Exposure, Undiscounted	760,000,000
Underlying mutual fund investment values for Guaranteed Minimum Income Benefits	$ 1,200,000,000