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Condensed Financial Information (Parent Company) (Long-term Debt Outstanding) (Details)
$ in Millions, ¥ in Billions
Dec. 31, 2021
USD ($)
Dec. 16, 2021
JPY (¥)
Jul. 15, 2021
JPY (¥)
Mar. 31, 2021
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Oct. 01, 2019
JPY (¥)
Jul. 31, 2019
JPY (¥)
Condensed Financial Statements, Captions [Line Items]                
Debt Instrument, Face Amount | $         $ 3,200      
Parent Company                
Condensed Financial Statements, Captions [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage 2.12%     100.00%        
Long-term Debt [Abstract]                
Senior Notes | $ $ 12,814       13,463      
Notes Payable, Related Parties | $ 1,884       2,073      
Long-term Debt | $ $ 14,698       15,536      
Parent Company | Senior Notes, Unaffiliated [Member]                
Long-term Debt [Abstract]                
Weighted Average Interest Rate 4.44%              
Senior Notes | $ $ 12,814       13,463      
Parent Company | 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 2.25%              
Senior Notes | $           $ 250    
Notes Payable, Related Parties | $ $ 1,884       $ 2,073      
Minimum | Parent Company | Senior Notes, Unaffiliated [Member]                
Long-term Debt [Abstract]                
Debt Instrument, Interest Rate, Effective Percentage 0.50%              
Minimum | Parent Company | Senior Notes, Affiliated [Member]                
Long-term Debt [Abstract]                
Debt Instrument, Interest Rate, Effective Percentage 1.59%              
Maximum | Parent Company | Senior Notes, Unaffiliated [Member]                
Long-term Debt [Abstract]                
Debt Instrument, Interest Rate, Effective Percentage 6.50%              
Maximum | Parent Company | Senior Notes, Affiliated [Member]                
Long-term Debt [Abstract]                
Debt Instrument, Interest Rate, Effective Percentage 2.02%              
SeniorDebtYen37.3BillionJuly2023 [Member] | Parent Company | Senior Notes, Affiliated [Member]                
Condensed Financial Statements, Captions [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage               1.602%
Long-term Debt [Abstract]                
Senior Notes               ¥ 37.3
SeniorNote16.0BillionYenJuly2026 [Member] | Parent Company | Senior Notes, Affiliated [Member]                
Condensed Financial Statements, Captions [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage               1.637%
Long-term Debt [Abstract]                
Senior Notes               ¥ 16.0
SeniorNote26.5BillionYenMaturityOctober2029 [Member] | Parent Company | Senior Notes, Affiliated [Member]                
Condensed Financial Statements, Captions [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage             1.81%  
Long-term Debt [Abstract]                
Senior Notes             ¥ 26.5  
SeniorDebtYen53.7BillionJune2021 | Parent Company | 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 | Parent Company | 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 | Parent Company | 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 | Parent Company | Senior Notes, Affiliated [Member]                
Long-term Debt [Abstract]                
Senior Notes     ¥ 25.7          
SeniorDebtYen25.7BillionJuly2028 | Parent Company | Senior Notes, Affiliated [Member]                
Condensed Financial Statements, Captions [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage     1.852%          
SeniorDebtYen54.6BillionDecember2021 | Parent Company | 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 | Parent Company | 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 | Parent Company | 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 | Parent Company | 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