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Condensed Financial Information (Parent Company) (Long-term Debt Outstanding) (Details) - Parent Company
$ in Millions, ¥ in Billions
Dec. 31, 2022
USD ($)
Mar. 31, 2022
Dec. 31, 2021
USD ($)
Dec. 16, 2021
JPY (¥)
Jul. 15, 2021
JPY (¥)
Jun. 30, 2021
USD ($)
Condensed Financial Statements, Captions [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage 5.23% 100.00% 212.00%      
Long-term Debt [Abstract]            
Senior Notes | $ $ 13,588   $ 12,814      
Notes Payable, Related Parties | $ 1,676   1,884      
Long-term Debt | $ $ 15,264   14,698      
Senior Notes, Unaffiliated [Member]            
Long-term Debt [Abstract]            
Weighted Average Interest Rate 4.42%          
Senior Notes | $ $ 13,588   12,814      
Senior Notes, Affiliated [Member]            
Condensed Financial Statements, Captions [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage           182.00%
Long-term Debt [Abstract]            
Weighted Average Interest Rate 1.98%          
Senior Notes | $           $ 250
Notes Payable, Related Parties | $ $ 1,676   $ 1,884      
Minimum | Senior Notes, Unaffiliated [Member]            
Long-term Debt [Abstract]            
Debt Instrument, Interest Rate, Effective Percentage 0.50%          
Minimum | Senior Notes, Affiliated [Member]            
Long-term Debt [Abstract]            
Debt Instrument, Interest Rate, Effective Percentage 1.59%          
Maximum | Senior Notes, Unaffiliated [Member]            
Long-term Debt [Abstract]            
Debt Instrument, Interest Rate, Effective Percentage 6.50%          
Maximum | Senior Notes, Affiliated [Member]            
Long-term Debt [Abstract]            
Debt Instrument, Interest Rate, Effective Percentage 6.56%          
SeniorDebtYen53.7BillionJune2021 | Senior Notes, Affiliated [Member]            
Condensed Financial Statements, Captions [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage         2.9725%  
Long-term Debt [Abstract]            
Senior Notes         ¥ 53.7  
SeniorDebtYen13.7BillionJuly2026 | Senior Notes, Affiliated [Member]            
Condensed Financial Statements, Captions [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage         1.61%  
Long-term Debt [Abstract]            
Senior Notes         ¥ 13.7  
SeniorDebtYen14.3BillionJuly2028 | Senior Notes, Affiliated [Member]            
Condensed Financial Statements, Captions [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage         1.755%  
Long-term Debt [Abstract]            
Senior Notes         ¥ 14.3  
SeninorDebtYen25.7BillionJuly2031 | Senior Notes, Affiliated [Member]            
Long-term Debt [Abstract]            
Senior Notes         ¥ 25.7  
SeniorDebtYen25.7BillionJuly2028 | Senior Notes, Affiliated [Member]            
Condensed Financial Statements, Captions [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage         1.852%  
SeniorDebtYen54.6BillionDecember2021 | Senior Notes, Affiliated [Member]            
Condensed Financial Statements, Captions [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage       3.135%    
Long-term Debt [Abstract]            
Senior Notes       ¥ 54.6    
SeniorDebtYen12.2BillionDecember2021 | Senior Notes, Affiliated [Member]            
Condensed Financial Statements, Captions [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage       1.588%    
Long-term Debt [Abstract]            
Senior Notes       ¥ 12.2    
SeniorDebtYen19.1BillionDecember2021 | Senior Notes, Affiliated [Member]            
Condensed Financial Statements, Captions [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage       1.7185%    
Long-term Debt [Abstract]            
Senior Notes       ¥ 19.1    
SeniorDebtYen23.3BillionDecember2021 | Senior Notes, Affiliated [Member]            
Condensed Financial Statements, Captions [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage       1.85%    
Long-term Debt [Abstract]            
Senior Notes       ¥ 23.3