Changes in and Reclassifications from Accumulated Other Comprehensive Income Reclassifications from AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income before income taxes	$ 31	$ 145
Income Tax Expense (Benefit)	(1)	20
Net income (loss)	32	125
Net investment income	238	312
Amount reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total amounts reclassified from AOCI	5	9
Amount reclassified from AOCI | Currency Swap [Member] | Cash Flow Hedging | Net realized capital gain/(loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Foreign currency swaps	0
Accumulated Net Unrealized Investment Gain (Loss) | Amount reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other net realized capital gains (losses)	6	4
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	6	4
Income Tax Expense (Benefit)	1	1
Total amounts reclassified from AOCI	5	3
Accumulated Net Unrealized Investment Gain (Loss) | Amount reclassified from AOCI | Net realized capital gain/(loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other net realized capital gains (losses)	6	4
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Cash Flow Hedging
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total amounts reclassified from AOCI	0	6
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Currency Swap [Member] | Cash Flow Hedging | Net realized capital gain/(loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Foreign currency swaps	0	2
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Amount reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest		7
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Amount reclassified from AOCI | Cash Flow Hedging
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income Tax Expense (Benefit)	$ 0	1
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Amount reclassified from AOCI | Interest rate swaps
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net investment income		5
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Amount reclassified from AOCI | Currency Swap [Member] | Cash Flow Hedging | Net realized capital gain/(loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Foreign currency swaps		$ 2