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Condensed Financial Information (Parent Company) (Long-term Debt Outstanding) (Details)
$ in Millions, ¥ in Billions
1 Months Ended 12 Months Ended
May 08, 2018
USD ($)
Apr. 19, 2018
USD ($)
Mar. 22, 2018
USD ($)
Mar. 19, 2018
USD ($)
Oct. 31, 2019
Jul. 31, 2019
JPY (¥)
Dec. 31, 2019
USD ($)
Oct. 01, 2019
JPY (¥)
Dec. 31, 2018
USD ($)
Jul. 31, 2018
May 08, 2018
JPY (¥)
Apr. 19, 2018
JPY (¥)
Mar. 22, 2018
JPY (¥)
Mar. 19, 2018
JPY (¥)
Condensed Financial Statements, Captions [Line Items]                            
Debt Instrument, Face Amount             $ 3,200   $ 3,200          
Parent Company                            
Long-term Debt [Abstract]                            
Senior Notes             12,379   11,844          
Notes Payable, Related Parties             1,976   1,957          
Long-term Debt             $ 14,355   13,801          
Parent Company | Senior Notes, Unaffiliated [Member]                            
Long-term Debt [Abstract]                            
Weighted Average Interest Rate             4.72%              
Debt Instrument, Maturity Date Range, Start             Dec. 15, 2022              
Debt Instrument, Maturity Date Range, End             May 13, 2046              
Senior Notes             $ 12,379   11,844          
Parent Company | Senior Notes, Affiliated [Member]                            
Condensed Financial Statements, Captions [Line Items]                            
Debt Instrument, Interest Rate, Stated Percentage 3.14% 2.97%   1.45%             3.14% 2.97%   1.45%
Long-term Debt [Abstract]                            
Weighted Average Interest Rate             2.25%              
Debt Instrument, Maturity Date Range, Start             Sep. 30, 2020              
Debt Instrument, Maturity Date Range, End             Oct. 01, 2029              
Senior Notes $ 500 $ 500   $ 500             ¥ 54.6 ¥ 53.7   ¥ 53.3
Notes Payable, Related Parties             $ 1,976   $ 1,957          
Debt Instrument, Maturity Date Dec. 16, 2021 Jul. 15, 2021   Jul. 01, 2019                    
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             0.82%              
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                
Debt Instrument, Maturity Date           Jul. 01, 2023                
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                
Debt Instrument, Maturity Date           Jul. 01, 2026                
MaturityOctober2019Rate1.72 [Member] | Parent Company | Senior Notes, Affiliated [Member]                            
Condensed Financial Statements, Captions [Line Items]                            
Debt Instrument, Interest Rate, Stated Percentage     1.72%                   1.72%  
Long-term Debt [Abstract]                            
Senior Notes     $ 250                   ¥ 26.5  
Debt Instrument, Maturity Date     Oct. 01, 2019                      
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            
Debt Instrument, Maturity Date         Oct. 01, 2029                  
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  
Debt Instrument, Maturity Date     Sep. 30, 2020