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Changes in Accumulated Other Comprehensive Income (Details 1) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Other expense                 $ (5,325) $ (5,856) $ (5,664)
Income tax provision                 (1,161) (1,670) (1,201)
Net income (loss) $ 1,438 $ 1,073 $ 257 $ 367 $ 1,693 $ 1,755 $ 1,761 $ 1,550 3,135 6,759 6,921
Foreign Currency Translation Adjustments [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Other expense                 3 0 1
Income tax provision                 0 0 (1)
Net income (loss)                 $ 3 $ 0 $ 0