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Parent Company Only Condensed Balance Sheets (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
ASSETS    
Accounts receivable, net $ 2,579 $ 2,539
Prepaid expenses and other current assets 386 369
Other noncurrent assets 3,647 3,449
Total assets 142,491 144,206
LIABILITIES AND SHAREHOLDERS’ EQUITY    
Current liabilities 12,458 9,875
Deferred income taxes 19,096 18,108
Other long-term liabilities 4,217 4,198
Shareholder's equity 14,050 23,805
Total liabilities and shareholder's equity 142,491 144,206
Parent Company [Member]    
ASSETS    
Accounts receivable, net 1 1
Receivables from related party 33 28
Prepaid expenses and other current assets 24 20
Investment in subsidiaries 33,129 41,813
Loans receivable - related party 284 275
Other noncurrent assets 0 1
Total assets 33,471 42,138
LIABILITIES AND SHAREHOLDERS’ EQUITY    
Current liabilities 45 22
Deferred income taxes 19,020 18,030
Other long-term liabilities 356 281
Shareholder's equity 14,050 23,805
Total liabilities and shareholder's equity $ 33,471 $ 42,138