Fair Value Measurements (Non-U.S. Pension Benefit Plans) (Details) - Non U.S. Pension Benefit Plans - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Cash	$ 45	$ 457
Accrued income receivable	0	2
Fair value plan assets	1,565	1,696	$ 1,806
Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	47	49
Common stock and equivalents
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	161	21
Common stock and equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	161	21
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	345	293
Commingled equity funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	172	0
Commingled equity funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	173	293
Government, agency, and government-sponsored enterprise obligations
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	823	811
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	823	811
Commingled bond funds
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	143	56
Commingled bond funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	107	0
Commingled bond funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	36	56
Commingled short-term investment funds
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	1	7
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	1	7
Total Investment securities
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	1,473	1,188
Total Investment securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	440	21
Total Investment securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total investments securities	$ 1,033	$ 1,167