Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
Income tax (benefit) expense		$ 303	$ 513	$ (77)
Net discrete tax adjustments	$ 135	65	294	(458)
Discrete adjustments, other		18	(5)
Valuation allowance	317	317	318
Provisional tax expense, Tax Cuts and Jobs Act of 2017		298	299
Provisional tax expense, Tax Cuts and Jobs Act of 2017, revaluing deferred tax assets			384
Provisional tax expense, Tax Cuts and Jobs Act of 2017, reversal of foreign earnings reserves	(171)	9	162	0
Provision for undistributed foreign earnings amount, adjustment	9
Provisional liability			77
Transition tax obligation, amount		8	77	0
Provisional tax expense, Tax Cuts and Jobs Act of 2017, one-time transition tax		85
Income tax benefit resulting from election change				(163)
Operating loss carryforwards, foreign	562	562
Federal tax assets for net operating loss and tax credit carryforwards	815	815
State tax assets for net operating loss and tax credit carryforwards	96	96
Foreign tax credits subject to expiration	740	740
Tax credits from research and development	75	75
Unrecognized tax benefits	71	71	52	63	$ 54
Favorable tax expense impact of unrecognized tax benefits, if recognized	71	71
Accrued interest	2	2
Unsettled unrecognized tax benefits that would require cash	6	6
Undistributed foreign subsidiaries earnings	2,200	2,200	2,800
Foreign earnings repatriated		900
Amount of unrecognized deferred tax liability, undistributed earnings of foreign subsidiaries	77	77
Income tax cash payments, net		178	144	153
VENEZUELA
Income Taxes [Line Items]
Net establishment (release) of valuation allowances	88
Write off of deferred tax assets	37
Foreign tax credits subject to expiration	637	637
Foreign Tax Authority
Income Taxes [Line Items]
Net establishment (release) of valuation allowances		5	(1)	354
Valuation allowance	204	204
Amount subject to expiration	60	60
Foreign Tax Authority | Deferred Tax Assets of Certain Subsidiaries in England, France, Luxembourg and New Zealand
Income Taxes [Line Items]
Net establishment (release) of valuation allowances				331
Foreign Tax Authority | VENEZUELA
Income Taxes [Line Items]
Valuation allowance	98	98
Domestic Tax Authority
Income Taxes [Line Items]
Net establishment (release) of valuation allowances		(25)	$ (5)	(39)
Domestic Tax Authority | Deferred Tax Assets From Receivables of Deconsolidated Venezuelan Operations
Income Taxes [Line Items]
Net establishment (release) of valuation allowances				(39)
Domestic Tax Authority | Deferred Tax Assets Related to Brazil
Income Taxes [Line Items]
Net establishment (release) of valuation allowances				$ 7
Domestic and State and Local Authority
Income Taxes [Line Items]
Valuation allowance	$ 113	$ 113