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Condensed Financial Information (Parent Company) (Long-term Debt - Narrative) (Details)
$ in Millions, ¥ in Billions
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
May 08, 2018
USD ($)
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, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 90   $ 88                
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 77                    
Long-term Debt, Maturities, Repayments of Principal in Year Two 527                    
Long-term Debt, Maturities, Repayments of Principal in Year Three 1,000                    
Long-term Debt, Maturities, Repayments of Principal in Year Four 2,100                    
Long-term Debt, Maturities, Repayments of Principal in Year Five 1,200                    
Long-term Debt, Maturities, Repayments of Principal after Year Five 9,600                    
Debt Instrument, Face Amount     3,200                
Parent Company                      
Condensed Financial Statements, Captions [Line Items]                      
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 1,000                    
Long-term Debt, Maturities, Repayments of Principal in Year Two 500                    
Long-term Debt, Maturities, Repayments of Principal in Year Three 1,400                    
Long-term Debt, Maturities, Repayments of Principal in Year Four 1,500                    
Long-term Debt, Maturities, Repayments of Principal in Year Five 1,200                    
Long-term Debt, Maturities, Repayments of Principal after Year Five 9,900                    
Senior Notes 13,463   12,379                
Parent Company | Senior Notes Unaffiliated [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net 85   81                
Senior Notes $ 13,463   $ 12,379                
Parent Company | Senior Notes, Affiliated [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Senior Notes   $ 250   $ 500 ¥ 54.6 $ 500 ¥ 53.7     $ 500 ¥ 53.3
MaturityOctober2019Rate1.72 [Member] | Parent Company | Senior Notes, Affiliated [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Senior Notes               $ 250 ¥ 26.5    
MaturitySeptember2020Rate.82 [Member] | Parent Company | Senior Notes, Affiliated [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Senior Notes               $ 250 ¥ 26.5