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Parent Company Only Condensed Statements of Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
INCOME      
Revenues $ 51,682 $ 48,097 $ 45,764
Interest income (4,037) (3,848) (3,797)
EXPENSES      
Operating costs and expenses 31,482 29,930 29,224
Income before income taxes 6,388 4,302 2,431
Income tax expense (1,068) (626) (439)
Net income 4,654 3,222 1,668
Parent Company [Member]      
INCOME      
Revenues 5 64 52
Interest income 7 12 10
Equity in income of subsidiaries 5,632 3,771 1,998
Total Income 5,644 3,847 2,060
EXPENSES      
Operating costs and expenses 5 64 52
Income before income taxes 5,639 3,783 2,008
Income tax expense (985) (561) (340)
Net income $ 4,654 $ 3,222 $ 1,668