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Shareholders' Equity (Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance $ (3,550) $ (3,818)  
Other comprehensive income, pretax 2,088 266 $ (574)
Benefit from (provision for) income tax, net (458) 2 156
Other comprehensive (loss) income, net amount 1,630    
Ending balance (1,920) (3,550) (3,818)
Gains (Losses) on Cash Flow Hedges      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance 272 2 (71)
Other comprehensive income, pretax (174) 366 97
Benefit from (provision for) income tax, net 46 (96) (24)
Other comprehensive (loss) income, net amount (128) 270 73
Ending balance 144 272 2
Foreign Currency Translation Adjustments      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance 641 288 102
Other comprehensive income, pretax (103) 353 186
Benefit from (provision for) income tax, net 0 0 0
Other comprehensive (loss) income, net amount (103) 353 186
Ending balance 538 641 288
Changes In Retirement Plans' Funded Status      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance (4,463) (4,108) (3,431)
Other comprehensive income, pretax 2,365 (453) (857)
Benefit from (provision for) income tax, net (504) 98 180
Other comprehensive (loss) income, net amount 1,861 (355) (677)
Ending balance (2,602) (4,463) (4,108)
AOCL      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance     (3,400)
Other comprehensive (loss) income, net amount   $ 268 $ (418)
Ending balance $ (1,920)