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Investments (Exposure To Concentrations Of Credit Risk) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Document Period End Date	Mar. 31, 2021
Government Of Japan [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 3,366	$ 1,493
Available-for-sale Securities	3,352	1,491
Canadian Province Of Quebec Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,337	1,303
Available-for-sale Securities	2,175	2,474
Canadian Province Of Ontario Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,081	1,054
Available-for-sale Securities	$ 1,427	$ 1,528

X

- Definition

For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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