Changes in Accumulated Other Comprehensive Income (Details 1) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expense									$ (5,868)	$ (5,671)	$ (5,634)
Income tax provision									(1,670)	(1,201)	(4,677)
Net income	$ 1,693	$ 1,755	$ 1,761	$ 1,550	$ 2,010	$ 1,654	$ 1,623	$ 1,634	6,759	6,921	2,748
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									0	1	(7)
Income tax provision									0	(1)	14
Net income									$ 0	$ 0	$ 7