Pensions and Other Employee Benefits, Changes in Benefit Obligations, Plan Assets and Funded Status and Aggregate Balance Sheet Impact (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Assets and (liabilities) recognized on the consolidated balance sheets consist of [Abstract]
Non-current liabilities	$ (1,177)	$ (1,047)
Pension Plans [Member]
Change in benefit obligation [Abstract]
Benefit obligation at the beginning of the year	3,448	3,663
Service cost	108	123	$ 106
Interest cost	135	149	147
Plan participants' contributions	2	2
Amendments	15
Actuarial loss (gain)	167	(261)
Foreign currency exchange rate changes	9	(53)
Curtailments, settlements and special termination benefits	2	3
Business divestiture	0	(59)
Benefits paid	(128)	(119)
Benefit obligation at the end of the year	3,758	3,448	3,663
Change in plan assets [Abstract]
Fair value of plan assets at the beginning of the year	2,552	2,570
Actual return on plan assets	189	54
Employer contributions	97	97
Plan participants' contributions	2	2
Foreign currency exchange rate changes	9	(52)
Benefits paid	(128)	(119)
Fair value of plan assets at the end of the year	2,721	2,552	2,570
Unfunded status at the end of the year	(1,037)	(896)
Assets and (liabilities) recognized on the consolidated balance sheets consist of [Abstract]
Non-current assets	37	37
Current liabilities	(6)	(5)
Non-current liabilities	(1,068)	(928)
Total	(1,037)	(896)
Postretirement Benefit Plans [Member]
Change in benefit obligation [Abstract]
Benefit obligation at the beginning of the year	184	199
Service cost	2	3	3
Interest cost	6	7	8
Plan participants' contributions	4	4
Amendments	(3)
Actuarial loss (gain)	(3)	(12)
Foreign currency exchange rate changes	0	(4)
Curtailments, settlements and special termination benefits	0	0
Business divestiture	0	0
Benefits paid	(13)	(13)
Benefit obligation at the end of the year	177	184	199
Change in plan assets [Abstract]
Fair value of plan assets at the beginning of the year	57	60
Actual return on plan assets	5	0
Employer contributions	7	6
Plan participants' contributions	4	4
Foreign currency exchange rate changes	0	0
Benefits paid	(13)	(13)
Fair value of plan assets at the end of the year	60	57	$ 60
Unfunded status at the end of the year	(117)	(127)
Assets and (liabilities) recognized on the consolidated balance sheets consist of [Abstract]
Non-current assets	0	0
Current liabilities	(8)	(8)
Non-current liabilities	(109)	(119)
Total	$ (117)	$ (127)