Retirement Plans (Retirement Plans, Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Expense for the defined contribution plans for continuing operations	$ 288	$ 347	$ 313
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at end of period	1,000	1,200
Fair value of plan assets at end of period	872	891
Funded status at end of period	174	347
Accumulated benefit obligation at end of period	990	1,200
Amounts recognized on the Consolidated Balance Sheets
Accrued employee compensation and benefits	20	22
Employee compensation and benefits	155	325
Pension plans in which projected benefit obligation exceeded plan assets
Projected benefit obligation	1,042	1,232
Fair value of plan assets	867	884
Pension plans in which accumulated benefit obligation exceeded plan assets
Accumulated benefit obligation	964	1,120
Fair value of plan assets	846	860
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	872	891
Foreign Pension Plans, Defined Benefit | Cash and Cash Equivalents [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	46
Foreign Pension Plans, Defined Benefit | Equity funds (a)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	209	320
Foreign Pension Plans, Defined Benefit | Bond funds (b)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	250	267
Foreign Pension Plans, Defined Benefit | alternatives fund [Domain]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	88	148
Foreign Pension Plans, Defined Benefit | Real Estate Funds [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	231	86
Foreign Pension Plans, Defined Benefit | Other assets
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	48	70
Foreign Pension Plans, Defined Benefit | Level 1
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	2	6
Foreign Pension Plans, Defined Benefit | Level 1 | Cash and Cash Equivalents [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	0
Foreign Pension Plans, Defined Benefit | Level 1 | Equity funds (a)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	0	0
Foreign Pension Plans, Defined Benefit | Level 1 | Bond funds (b)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	0	0
Foreign Pension Plans, Defined Benefit | Level 1 | alternatives fund [Domain]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	0	0
Foreign Pension Plans, Defined Benefit | Level 1 | Real Estate Funds [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	0	0
Foreign Pension Plans, Defined Benefit | Level 1 | Other assets
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	2	6
Foreign Pension Plans, Defined Benefit | Level 2
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	759	784
Foreign Pension Plans, Defined Benefit | Level 2 | Cash and Cash Equivalents [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	46
Foreign Pension Plans, Defined Benefit | Level 2 | Equity funds (a)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	209	320
Foreign Pension Plans, Defined Benefit | Level 2 | Bond funds (b)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	212	197
Foreign Pension Plans, Defined Benefit | Level 2 | alternatives fund [Domain]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	42	148
Foreign Pension Plans, Defined Benefit | Level 2 | Real Estate Funds [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	231	86
Foreign Pension Plans, Defined Benefit | Level 2 | Other assets
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	19	33
Foreign Pension Plans, Defined Benefit | Level 3
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	111	101
Foreign Pension Plans, Defined Benefit | Level 3 | Cash and Cash Equivalents [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	0
Foreign Pension Plans, Defined Benefit | Level 3 | Equity funds (a)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	0	0
Foreign Pension Plans, Defined Benefit | Level 3 | Bond funds (b)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	38	70
Foreign Pension Plans, Defined Benefit | Level 3 | alternatives fund [Domain]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	46	0
Foreign Pension Plans, Defined Benefit | Level 3 | Real Estate Funds [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	0	0
Foreign Pension Plans, Defined Benefit | Level 3 | Other assets
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	$ 27	$ 31
United Kingdom Pension Plan
Pension plans in which accumulated benefit obligation exceeded plan assets
United Kingdom pension plan percentage of international pension plans' projected benefit obligations	81.00%