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Schedule I (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]      
Cash Dividends Paid to Parent, Consolidated Subsidiaries $ 8,300 $ 5,600  
Parent Company [Member]      
Condensed Financial Statements, Captions [Line Items]      
Cash Dividends Paid to Parent, Consolidated Subsidiaries 10,000 5,600 $ 5,600
Return of capital to parent company 943 4,497 $ 4,196
Notes Payable 4,900    
Subsidiaries [Member]      
Condensed Financial Statements, Captions [Line Items]      
Other Long-term Debt $ 1,200 $ 1,200