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Condensed Financial Information (Parent Company) (Long-term Debt - Narrative) (Details)
$ in Millions, ¥ in Billions
May 08, 2018
USD ($)
Apr. 19, 2018
USD ($)
Mar. 22, 2018
USD ($)
Mar. 19, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
May 08, 2018
JPY (¥)
Apr. 19, 2018
JPY (¥)
Mar. 22, 2018
JPY (¥)
Mar. 19, 2018
JPY (¥)
Condensed Financial Statements, Captions [Line Items]                    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net         $ 88 $ 87        
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months         33          
Long-term Debt, Maturities, Repayments of Principal in Year Two         27          
Long-term Debt, Maturities, Repayments of Principal in Year Three         527          
Long-term Debt, Maturities, Repayments of Principal in Year Four         1,000          
Long-term Debt, Maturities, Repayments of Principal in Year Five         2,000          
Long-term Debt, Maturities, Repayments of Principal after Year Five         9,800          
Debt Instrument, Face Amount         3,200 3,200        
Parent Company                    
Condensed Financial Statements, Captions [Line Items]                    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months         244          
Long-term Debt, Maturities, Repayments of Principal in Year Two         997          
Long-term Debt, Maturities, Repayments of Principal in Year Three         500          
Long-term Debt, Maturities, Repayments of Principal in Year Four         1,300          
Long-term Debt, Maturities, Repayments of Principal in Year Five         1,500          
Long-term Debt, Maturities, Repayments of Principal after Year Five         9,800          
Senior Notes         12,379 11,844        
Parent Company | Senior Notes Unaffiliated [Member]                    
Condensed Financial Statements, Captions [Line Items]                    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net         81 79        
Senior Notes         $ 12,379 $ 11,844        
Parent Company | Senior Notes, Affiliated [Member]                    
Condensed Financial Statements, Captions [Line Items]                    
Senior Notes $ 500 $ 500   $ 500     ¥ 54.6 ¥ 53.7   ¥ 53.3
Debt Instrument, Maturity Date Dec. 16, 2021 Jul. 15, 2021   Jul. 01, 2019            
MaturityOctober2019Rate1.72 [Member] | Parent Company | Senior Notes, Affiliated [Member]                    
Condensed Financial Statements, Captions [Line Items]                    
Senior Notes     $ 250           ¥ 26.5  
Debt Instrument, Maturity Date     Oct. 01, 2019              
MaturitySeptember2020Rate.82 [Member] | Parent Company | Senior Notes, Affiliated [Member]                    
Condensed Financial Statements, Captions [Line Items]                    
Senior Notes     $ 250           ¥ 26.5  
Debt Instrument, Maturity Date     Sep. 30, 2020