Recent Accounting Pronouncements (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts Receivable, Less Allowances	$ 4,349		$ 4,136	$ 3,871	$ 3,879
Inventories	3,370		3,005	2,719	2,971
Other current assets	1,172		922	1,465	1,236
Other Assets	2,011	$ 1,758	1,117	1,168	1,227
Contract liabilities	916		809	736	0
Deferred Revenue				0	719
Other accrued expenses	1,675	1,602	1,470	1,695	1,848
Deferred Income Taxes	2,192		2,265	2,711	2,766
Other Long-term Liabilities	3,241	3,020	2,515	2,643	2,569
Long-term Obligations				18,870	18,873
Retained earnings	22,092	18,700	18,696	16,032	15,914
Accumulated other comprehensive items	$ (2,679)		(2,498)	(2,091)	$ (2,003)
Impact of Adopting New Lease Guidance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other Assets		641
Other accrued expenses		132
Other Long-term Liabilities		505
Retained earnings		$ 4
Impact of Adopting New Equity Investment Guidance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings				(1)
Accumulated other comprehensive items				1
Impact of Adopting New Intra-entity Tax Guidance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other Assets				(77)
Deferred Income Taxes				(57)
Retained earnings				(20)
Impact of Adopting New Hedge Accounting Guidance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Long-term Obligations				(3)
Retained earnings				3
Impact of Adopting New Tax Effects on Items in AOCI Guidance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred Income Taxes				2
Retained earnings				87
Accumulated other comprehensive items				(89)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Inventories			(357)
Other current assets			$ 359
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Impact of Adopting New Revenue Guidance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts Receivable, Less Allowances				(8)
Inventories				(252)
Other current assets				229
Other Assets				18
Contract liabilities				736
Deferred Revenue				(719)
Other accrued expenses				(153)
Other Long-term Liabilities				74
Retained earnings				$ 49