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Accumulated Other Comprehensive Income (Loss) - Components of AOCI (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income [Roll Forward]      
Beginning balance $ 6,121 $ 5,068 $ 4,232
Reclassification of certain tax effects   0  
Ending balance 4,989 6,121 5,068
Other comprehensive income (loss) allocated to noncontrolling interests 4 (3) (5)
Unrealized Gain (Loss) on Cash Flow Hedges      
Accumulated Other Comprehensive Income [Roll Forward]      
Beginning balance (54) (22) 1
Other comprehensive income (loss), before reclassifications 74 (111) (1)
Amounts reclassified from other comprehensive income (26) 79 (22)
Other comprehensive income (loss) 48 (32) (23)
Reclassification of certain tax effects   0  
Ending balance (6) (54) (22)
Change in Retirement Plans’ Funded Status      
Accumulated Other Comprehensive Income [Roll Forward]      
Beginning balance (650) (473) (950)
Other comprehensive income (loss), before reclassifications 143 (68) 473
Amounts reclassified from other comprehensive income (146) (44) 4
Other comprehensive income (loss) (3) (112) 477
Reclassification of certain tax effects   (65)  
Ending balance (653) (650) (473)
Foreign Currency Translation      
Accumulated Other Comprehensive Income [Roll Forward]      
Beginning balance (1,145) (1,216) (899)
Other comprehensive income (loss), before reclassifications (739) 71 (317)
Amounts reclassified from other comprehensive income 0 0 0
Other comprehensive income (loss) (739) 71 (317)
Reclassification of certain tax effects   0  
Ending balance (1,884) (1,145) (1,216)
Share of Other Comprehensive Income (Loss) of Entities Using the Equity Method      
Accumulated Other Comprehensive Income [Roll Forward]      
Beginning balance (153) (148) (118)
Other comprehensive income (loss), before reclassifications 20 (5) (30)
Amounts reclassified from other comprehensive income 0 0 0
Other comprehensive income (loss) 20 (5) (30)
Reclassification of certain tax effects   0  
Ending balance (133) (153) (148)
Total      
Accumulated Other Comprehensive Income [Roll Forward]      
Beginning balance (2,002) (1,859) (1,966)
Other comprehensive income (loss), before reclassifications (502) (113) 125
Amounts reclassified from other comprehensive income (172) 35 (18)
Other comprehensive income (loss) (674) (78) 107
Reclassification of certain tax effects   (65)  
Ending balance $ (2,676) $ (2,002) $ (1,859)