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Debt (Schedule Of Changes In Debt) (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Debt Instrument [Line Items] |  |
Balance as of beginning-of-year | $ 6,682 |
Notes issued |  | $ 1,289
Repayment of notes |  | $ (1,096)
Unamortized debt issuance costs | 3 |
Unamortized adjustments from discontinued hedges | (11) |
Fair value hedge on interest rate swap agreements | (51) |
Balance as of end-of-period | 6,623 |
LIBOR + 236 bps, due 2066 [Member] |  |
Debt Instrument [Line Items] |  |
Capital securities exchanged | (562) |
Notes issued | $ 562 |
LIBOR + 236 bps, due 2066 [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Debt Instrument [Line Items] |  |
Variable rate | 2.36% |
LIBOR + 204 bps, due 2067 [Member] |  |
Debt Instrument [Line Items] |  |
Capital securities exchanged | $ (433) |
Notes issued | $ 433 |
LIBOR + 204 bps, due 2067 [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Debt Instrument [Line Items] |  |
Variable rate | 2.04% |

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