Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		$ 1,264	$ 1,022	$ 481
Additions, Charged to Costs and Expenses		350	402	575
Additions, Charged to Other Accounts	[1]	(2)	(23)	26
Deductions	[2]	276	137	60
Balance at End of Period		1,336	1,264	1,022
Allowance for trade receivables
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		40	50	58
Additions, Charged to Costs and Expenses		2	3	21
Additions, Charged to Other Accounts	[1]	(4)	(6)	(8)
Deductions	[2]	3	7	21
Balance at End of Period		35	40	50
Allowance for other current receivables
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		47	98	93
Additions, Charged to Costs and Expenses		(1)	(10)	6
Additions, Charged to Other Accounts	[1]	1	(24)	6
Deductions	[2]	3	17	7
Balance at End of Period		44	47	98
Allowance for long-term receivables
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		24	21	20
Additions, Charged to Costs and Expenses		0	0	(1)
Additions, Charged to Other Accounts	[1]	0	3	3
Deductions	[2]	10	0	1
Balance at End of Period		14	24	21
Allowance for deferred taxes
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		1,153	853	310
Additions, Charged to Costs and Expenses		349	409	549
Additions, Charged to Other Accounts	[1]	1	4	25
Deductions	[2]	260	113	31
Balance at End of Period		$ 1,243	$ 1,153	$ 853

[1] Primarily related to divestitures, acquisitions and currency translation.

[2] Represents charges for which allowances were created.