Equity (Net Unrealized Investment Gains and Losses in AOCI with Allowance for Credit Losses) (Details) $ in Millions	3 Months Ended
Mar. 31, 2020 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 24,039
Ending balance	22,600
Accumulated Other Comprehensive Income (Loss) Related to Net Unrealized Investment Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	28,112
Ending balance	26,937
With an allowance \| Net Unrealized Gains (Losses) on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	0
Net investment gains (losses) on investments arising during the period	0
Reclassification adjustment for (gains) losses included in net income	(38)
Increase (decrease) due to non-credit related losses recognized in AOCI during the period	(80)
Ending balance	(118)
With an allowance \| DAC, DSI, VOBA and Reinsurance Recoverables
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	0
Impact of net unrealized investment (gains) losses on DAC, DSI, VOBA and reinsurance recoverables	2
Ending balance	2
With an allowance \| Future Policy Benefits, Policyholders’ Account Balances and Reinsurance Payables
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	0
Impact of net unrealized investment (gains) losses on future policy benefits, policyholders’ account balances and reinsurance payables	(5)
Ending balance	(5)
With an allowance \| Policyholders’ Dividends
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	0
Impact of net unrealized investment (gains) losses on policyholders’ dividends	4
Ending balance	4
With an allowance \| Deferred Income Tax (Liability) Benefit
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	0
Net investment gains (losses) on investments arising during the period	0
Reclassification adjustment for (gains) losses included in net income	6
Increase (decrease) due to non-credit related losses recognized in AOCI during the period	13
Impact of net unrealized investment (gains) losses on DAC, DSI, VOBA and reinsurance recoverables	0
Impact of net unrealized investment (gains) losses on future policy benefits, policyholders’ account balances and reinsurance payables	1
Impact of net unrealized investment (gains) losses on policyholders’ dividends	(1)
Ending balance	19
With an allowance \| Accumulated Other Comprehensive Income (Loss) Related to Net Unrealized Investment Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	0
Net investment gains (losses) on investments arising during the period	0
Reclassification adjustment for (gains) losses included in net income	(32)
Increase (decrease) due to non-credit related losses recognized in AOCI during the period	(67)
Impact of net unrealized investment (gains) losses on DAC, DSI, VOBA and reinsurance recoverables	2
Impact of net unrealized investment (gains) losses on future policy benefits, policyholders’ account balances and reinsurance payables	(4)
Impact of net unrealized investment (gains) losses on policyholders’ dividends	3
Ending balance	$ (98)

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