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Short-Term and Long-Term Debt (Schedule Of Debt) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2022
Oct. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]        
Current maturities of long-term debt $ 500   $ 500 $ 300
Total short-term debt 500   500 300
Total long-term debt $ 5,955   $ 5,955 6,325
Fixed rate, swap 5.00%   5.00%  
Debt repurchase option, Repayment as percent of principal     100.00%  
Senior notes [Member]        
Debt Instrument [Line Items]        
Senior Long Term Notes $ 4,368   $ 4,368 4,568
Subordinated Debt [Member]        
Debt Instrument [Line Items]        
Term loans 995   995 995
Capital Securities [Member]        
Debt Instrument [Line Items]        
Capital securities 218   218 218
Long-term Debt [Member]        
Debt Instrument [Line Items]        
Unamortized premiums (discounts) (6)   (6) (6)
Unamortized debt issuance costs (34)   (34) (35)
Unamortized adjustments from discontinued hedges 341   341 356
Fair value hedge on interest rate swap agreements (177)   (177) (21)
Total long-term debt $ 5,955   $ 5,955 6,325
4.00% notes, due 2023 [Member] | Senior notes [Member]        
Debt Instrument [Line Items]        
Senior Long Term Notes       500
Interest rate 4.00%   4.00%  
3.35% notes, due 2025 [Member] | Senior notes [Member]        
Debt Instrument [Line Items]        
Senior Long Term Notes $ 300   $ 300 300
Interest rate 3.35%   3.35%  
3.625% notes, due 2026 [Member] | Senior notes [Member]        
Debt Instrument [Line Items]        
Senior Long Term Notes $ 400   $ 400 400
Interest rate 3.625%   3.625%  
3.80% notes, due 2028 [Member] | Senior notes [Member]        
Debt Instrument [Line Items]        
Senior Long Term Notes $ 500   $ 500 500
Interest rate 3.80%   3.80%  
3.05% notes, due 2030 [Member] | Senior notes [Member]        
Debt Instrument [Line Items]        
Senior Long Term Notes $ 500   $ 500 500
Interest rate 3.05%   3.05%  
3.40% notes, due 2031 [Member] | Senior notes [Member]        
Debt Instrument [Line Items]        
Senior Long Term Notes $ 500   $ 500 500
Interest rate 3.40%   3.40%  
3.40% notes, due 2032 [Member] | Senior notes [Member]        
Debt Instrument [Line Items]        
Senior Long Term Notes $ 300   $ 300  
Interest rate 3.40%   3.40%  
6.15% notes, due 2036 [Member] | Senior notes [Member]        
Debt Instrument [Line Items]        
Senior Long Term Notes $ 243   $ 243 243
Interest rate 6.15%   6.15%  
6.30% notes, due 2037 [Member] | Senior notes [Member]        
Debt Instrument [Line Items]        
Senior Long Term Notes $ 375   $ 375 375
Interest rate 6.30%   6.30%  
7.00% notes, due 2040 [Member] | Senior notes [Member]        
Debt Instrument [Line Items]        
Senior Long Term Notes $ 500   $ 500 500
Interest rate 7.00%   7.00%  
4.35% notes, due 2048 [Member] | Senior notes [Member]        
Debt Instrument [Line Items]        
Senior Long Term Notes $ 450   $ 450 450
Interest rate 4.35%   4.35%  
4.375% notes, due 2050 [Member] | Senior notes [Member]        
Debt Instrument [Line Items]        
Senior Long Term Notes $ 300   $ 300 300
Interest rate 4.375%   4.375%  
LIBOR + 87.5 bps loan, due 2024 [Member] | Term Loans [Member]        
Debt Instrument [Line Items]        
Term loans $ 250   $ 250 250
Variable rate 112.50% 87.50% 20.24%  
LIBOR +236 bps, due 2066 [Member] | Subordinated Debt [Member]        
Debt Instrument [Line Items]        
Term loans $ 562   $ 562 562
Variable rate     2.36%  
LIBOR +236 bps, due 2066 [Member] | Capital Securities [Member]        
Debt Instrument [Line Items]        
Capital securities 160   $ 160 160
Variable rate     2.36%  
LIBOR +204 bps, due 2067 [Member] | Subordinated Debt [Member]        
Debt Instrument [Line Items]        
Term loans 433   $ 433 433
Variable rate     2.04%  
LIBOR +204 bps, due 2067 [Member] | Capital Securities [Member]        
Debt Instrument [Line Items]        
Capital securities $ 58   $ 58 $ 58
Variable rate     2.04%