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Short-Term and Long-Term Debt (Schedule Of Debt) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |
Current maturities of long-term debt | $ 300 |
Total short-term debt | 300 |
Total long-term debt | $ 6,325 | $ 6,682
Fixed rate, swap | 5.00% |
Debt repurchase option, Repayment as percent of principal | 100.00% |
Senior notes [Member] |  |
Debt Instrument [Line Items] |  |
Senior Long Term Notes | $ 4,568 | 4,868
Term Loans [Member] |  |
Debt Instrument [Line Items] |  |
Term loans | 250 | 250
Subordinated Debt [Member] |  |
Debt Instrument [Line Items] |  |
Term loans | 995 |
Capital Securities [Member] |  |
Debt Instrument [Line Items] |  |
Capital securities | 218 | 1,213
Long-term Debt [Member] |  |
Debt Instrument [Line Items] |  |
Unamortized premiums (discounts) | (6) | (6)
Unamortized debt issuance costs | (35) | (38)
Unamortized adjustments from discontinued hedges | 356 | 370
Fair value hedge on interest rate swap agreements | (21) | 25
Total long-term debt | $ 6,325 | 6,682
4.20% notes, due 2022 [Member] | Senior notes [Member] |  |
Debt Instrument [Line Items] |  |
Senior Long Term Notes |  | 300
Interest rate | 4.20% |
4.00% notes, due 2023 [Member] | Senior notes [Member] |  |
Debt Instrument [Line Items] |  |
Senior Long Term Notes | $ 500 | 500
Interest rate | 4.00% |
3.35% notes, due 2025 [Member] | Senior notes [Member] |  |
Debt Instrument [Line Items] |  |
Senior Long Term Notes | $ 300 | 300
Interest rate | 3.35% |
3.625% notes, due 2026 [Member] | Senior notes [Member] |  |
Debt Instrument [Line Items] |  |
Senior Long Term Notes | $ 400 | 400
Interest rate | 3.625% |
3.80% notes, due 2028 [Member] | Senior notes [Member] |  |
Debt Instrument [Line Items] |  |
Senior Long Term Notes | $ 500 | 500
Interest rate | 3.80% |
3.05% notes, due 2030 [Member] | Senior notes [Member] |  |
Debt Instrument [Line Items] |  |
Senior Long Term Notes | $ 500 | 500
Interest rate | 3.05% |
3.40% notes, due 2031 [Member] | Senior notes [Member] |  |
Debt Instrument [Line Items] |  |
Senior Long Term Notes | $ 500 | 500
Interest rate | 3.40% |
6.15% notes, due 2036 [Member] | Senior notes [Member] |  |
Debt Instrument [Line Items] |  |
Senior Long Term Notes | $ 243 | 243
Interest rate | 6.15% |
6.30% notes, due 2037 [Member] | Senior notes [Member] |  |
Debt Instrument [Line Items] |  |
Senior Long Term Notes | $ 375 | 375
Interest rate | 6.30% |
7.00% notes, due 2040 [Member] | Senior notes [Member] |  |
Debt Instrument [Line Items] |  |
Senior Long Term Notes | $ 500 | 500
Interest rate | 7.00% |
4.35% notes, due 2048 [Member] | Senior notes [Member] |  |
Debt Instrument [Line Items] |  |
Senior Long Term Notes | $ 450 | 450
Interest rate | 4.35% |
4.375% notes, due 2050 [Member] | Senior notes [Member] |  |
Debt Instrument [Line Items] |  |
Senior Long Term Notes | $ 300 | 300
Interest rate | 4.375% |
LIBOR + 87.5 bps loan, due 2024 [Member] | Term Loans [Member] |  |
Debt Instrument [Line Items] |  |
Term loans | $ 250 | 250
Variable rate | 0.875% |
LIBOR +236 bps, due 2066 [Member] | Subordinated Debt [Member] |  |
Debt Instrument [Line Items] |  |
Term loans | $ 562 |
Variable rate | 2.36% |
LIBOR +236 bps, due 2066 [Member] | Capital Securities [Member] |  |
Debt Instrument [Line Items] |  |
Capital securities | $ 160 | 722
Variable rate | 2.36% |
LIBOR +204 bps, due 2067 [Member] | Subordinated Debt [Member] |  |
Debt Instrument [Line Items] |  |
Term loans | $ 433 |
Variable rate | 2.04% |
LIBOR +204 bps, due 2067 [Member] | Capital Securities [Member] |  |
Debt Instrument [Line Items] |  |
Capital securities | $ 58 | $ 491
Variable rate | 2.04% |

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