Restructuring Charges (Narrative) (Details) € in Millions, $ in Millions		12 Months Ended
	Dec. 30, 2016 position	Dec. 31, 2016 EUR (€)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Payments for restructuring			$ 119	$ 202
Restructuring costs			173	201	$ 136
Asset impairment costs
Restructuring Cost and Reserve [Line Items]
Payments for restructuring			1	0
Restructuring costs			17	30
Other exit costs
Restructuring Cost and Reserve [Line Items]
Payments for restructuring			12	21
Restructuring costs			8	$ 23
Italy
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost | €		€ 241
Payments for restructuring		209	220
Italy | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		179				$ 189
Italy | Asset impairment costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		25				26
Italy | Other exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost		€ 37				39
UNITED KINGDOM
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost						88
Payments for restructuring			76
Restructuring, number of positions anticipated to be affected | position	500
Restructuring costs			$ 20
UNITED KINGDOM | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost						65
UNITED KINGDOM | Asset impairment costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost						12
UNITED KINGDOM | Other exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost						$ 11