Significant Accounting Policies and Pronouncements (Narratives) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2020	Jan. 01, 2019	[2]	Jan. 01, 2018	Jan. 01, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained Earnings (Accumulated Deficit)		$ 32,991	$ 30,470
Accumulated other comprehensive income (loss)		24,039	10,906
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		$ 63,719	49,031	$ 54,511						$ 46,255
Loan-to-value ratios (greater than)		100.00%
Debt service coverage ratios (less than)		1.0
Repurchase and Resale Agreements, Collateral, Percentage		95.00%
Uncertain Tax Positions Measurement Percentage (greater than)		50.00%
Charge related to change in estimate	[1]	$ (19,625)	(21,664)	(13,460)
Cumulative effect of adoption			9			$ (14)			$ 0
Operating Lease, Right-of-Use Asset		554
Operating Lease, Liability		594
Deferred Tax Liability, Policyholders Dividends and Deferred Policy Acquisition		$ 1,365	733
Securities Lending Transactions | Domestic operations
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Collateral for loaned securities		102.00%
Securities Lending Transactions | Foreign operations
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Collateral for loaned securities		105.00%
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful life		3 years
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful life		40 years
ASU 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adoption								$ 57
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset		$ 600
Operating Lease, Liability		600
Accumulated Other Comprehensive Income (Loss)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated other comprehensive income (loss)		24,039	10,906	17,074						14,621
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		24,039	10,906	17,074						14,621
Cumulative effect of adoption						7		1,653
Accumulated Other Comprehensive Income (Loss) | ASU 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adoption			(847)					(847)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		$ 32,991	$ 30,470	28,671						$ 22,113
Cumulative effect of adoption						$ (21)		(1,653)	$ (5)
Retained Earnings | ASU 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adoption								904
Subsequent Event | Retained Earnings | ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adoption					$ (100)
Accounts and Financing Receivable, after Allowance for Credit Loss					(152)
Deferred Tax Liability, Policyholders Dividends and Deferred Policy Acquisition					$ (52)
Restatement Adjustment | ASU 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained Earnings (Accumulated Deficit)								904
Accumulated other comprehensive income (loss)								847
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest								$ 57
Change in Accounting Method Accounted for as Change in Estimate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Charge related to change in estimate				$ (237)

[1]

[2] Includes the impact from the adoption of ASU 2017-08 and 2017-12. See Note 2.