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Equity (Summary of Changes in AOCI) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax $ (949) $ (440) $ (1,005) $ 49
Other comprehensive (loss) income, net - Foreign Currency Translation (506) 562 (1,050)  
Amounts reclassified, pretax - Foreign Currency Translation 0 0 2  
Tax benefit (expense) (3) 3 (6)  
Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, after Tax (2,679) (2,026) (782) (1,828)
Other Comprehensive Income (Loss), Defined Benefit Plan, before Reclassification Adjustment and Tax (674) (1,041) 1,225  
Other Comprehensive Income (Loss), Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax (173) (568) 129  
Other Comprehensive Income (Loss), Defined Benefit Plan, after Reclassification Adjustment, Tax 194 365 (308)  
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax (127) 47 (231) (136)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax (291) 278 (246)  
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 63 80 103  
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax 54 (80) 48  
Other comprehensive (loss) income before reclassifications, net (1,471) (201) (71)  
Amounts reclassified, pretax (110) (488) 234  
Other Comprehensive Income (Loss), Tax 245 288 (266)  
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (3,755) $ (2,419) $ (2,018) $ (1,915)