Long-Term Employee Benefits (Contributions) (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Plan Other Than Principal Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions		$ 164	$ 190
Other Long-Term Employee Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions		237	233
Remaining pension plans with no plan assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions		144	121
U.S. Pension Plan Trust Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions		$ 0	$ 0	$ 0
Scenario, Forecast [Member] | Principal U.S. Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected 2016 contributions to principal U.S. pension plan	$ 230
Scenario, Forecast [Member] | Pension Plan Other Than Principal Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer Contributions in 2016	about the same
Scenario, Forecast [Member] | Other Long-Term Employee Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer Contributions in 2016	about the same
Scenario, Forecast [Member] | Remaining pension plans with no plan assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer Contributions in 2016	about the same