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Condensed Financial Information (Parent Company) (Long-term Debt Outstanding) (Details)
$ in Millions, ¥ in Billions
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Oct. 01, 2019
JPY (¥)
Jul. 31, 2019
JPY (¥)
May 08, 2018
USD ($)
May 08, 2018
JPY (¥)
Apr. 19, 2018
USD ($)
Apr. 19, 2018
JPY (¥)
Mar. 22, 2018
USD ($)
Mar. 22, 2018
JPY (¥)
Mar. 19, 2018
USD ($)
Mar. 19, 2018
JPY (¥)
Condensed Financial Statements, Captions [Line Items]                          
Debt Instrument, Face Amount     $ 3,200                    
Parent Company                          
Long-term Debt [Abstract]                          
Senior Notes $ 13,463   12,379                    
Notes Payable, Related Parties 2,073   1,976                    
Long-term Debt $ 15,536   14,355                    
Parent Company | Senior Notes, Unaffiliated [Member]                          
Long-term Debt [Abstract]                          
Weighted Average Interest Rate 4.28%                        
Senior Notes $ 13,463   12,379                    
Parent Company | Senior Notes, Affiliated [Member]                          
Condensed Financial Statements, Captions [Line Items]                          
Debt Instrument, Interest Rate, Stated Percentage   182.00%       3.14% 3.14% 2.97% 2.97%        
Long-term Debt [Abstract]                          
Weighted Average Interest Rate 2.31%                        
Senior Notes   $ 250       $ 500 ¥ 54.6 $ 500 ¥ 53.7     $ 500 ¥ 53.3
Notes Payable, Related Parties $ 2,073   $ 1,976                    
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 1.60%                        
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 3.14%                        
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                
MaturityOctober2019Rate1.72 [Member] | Parent Company | Senior Notes, Affiliated [Member]                          
Long-term Debt [Abstract]                          
Senior Notes                   $ 250 ¥ 26.5    
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                  
MaturitySeptember2020Rate.82 [Member] | Parent Company | Senior Notes, Affiliated [Member]                          
Condensed Financial Statements, Captions [Line Items]                          
Debt Instrument, Interest Rate, Stated Percentage                   0.82% 0.82%    
Long-term Debt [Abstract]                          
Senior Notes                   $ 250 ¥ 26.5