Significant Accounting Policies and Pronouncements (Summary of Transition Impact) (Details) - USD ($) $ in Millions		Mar. 31, 2020		Jan. 01, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Fixed maturities, held-to-maturity	[2]	$ 1,895	[1]		$ 1,933
Commercial mortgage and other loans	[2]	63,559	[1]		63,559
Other invested assets	[2]	18,071	[1]		15,606
Deferred policy acquisition costs		19,738	[1]		19,912
Other assets	[2]	20,694	[1]		20,832
Total Assets		873,712			896,552
Policyholders’ dividends		6,396	[1]		6,988
Other liabilities	[2]	17,853	[1]		20,802
Income taxes		11,117	[1]		11,378
Total liabilities		812,640			832,833
Retained earnings		32,176			32,991
Total equity		61,072			63,719	$ 55,450	$ 49,031
Total liabilities and equity		$ 873,712			$ 896,552
Restatement Adjustment | ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Fixed maturities, held-to-maturity				$ (9)
Commercial mortgage and other loans				(115)
Other invested assets				(1)
Deferred policy acquisition costs				9
Other assets				(6)
Total Assets				(122)
Policyholders’ dividends				(14)
Other liabilities				21
Income taxes				(30)
Total liabilities				(23)
Retained earnings				(99)
Total equity				(99)
Total liabilities and equity				$ (122)

[1] March 31, 2020 amounts include the impacts of the January 1, 2020 adoption of ASU 2016-13. See Note 2 for details.

[2] See Note 4 for details of balances associated with variable interest entities.