Fair Value Measurements (Non-U.S. Plans) (Details) - Non U.S. Pension Benefit Plans - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Cash	$ 457	$ 233
Accrued income receivable	2	5
Fair value plan assets	1,696	1,806	$ 1,513
Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	49	55
Common stock and equivalents
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	21	194
Common stock and equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	21	194
Common stock and equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	0	0
Commingled equity funds
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	293	569
Commingled equity funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	0	0
Commingled equity funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	293	569
Government, agency, and government-sponsored enterprise obligations
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	811	26
Government, agency, and government-sponsored enterprise obligations | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	0	0
Government, agency, and government-sponsored enterprise obligations | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	811	26
Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Total investments securities		316
Corporate bonds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments securities		0
Corporate bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments securities		316
Commingled bond funds
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	56	399
Commingled bond funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	0	0
Commingled bond funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	56	399
Commingled short-term investment funds
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	7	9
Commingled short-term investment funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	0	0
Commingled short-term investment funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	7	9
Total Investment securities
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	1,188	1,513
Total Investment securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	21	194
Total Investment securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	$ 1,167	$ 1,319