Retirement Plans (Retirement Plans, Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Expense for the defined contribution plans for continuing operations	$ 111	$ 288	$ 347
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at end of period	1,100	1,000
Fair value of plan assets at end of period	865	872
Funded status at end of period	241	174
Accumulated benefit obligation at end of period	1,100	990
Amounts recognized on the Consolidated Balance Sheets
Accrued employee compensation and benefits	16	20
Employee compensation and benefits	227	155
Pension plans in which projected benefit obligation exceeded plan assets
Projected benefit obligation	1,083	1,042
Fair value of plan assets	840	867
Pension plans in which accumulated benefit obligation exceeded plan assets
Accumulated benefit obligation	1,037	964
Fair value of plan assets	840	846
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	865	872
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	49	46
Foreign Pension Plans, Defined Benefit | Equity funds (b)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	197	209
Foreign Pension Plans, Defined Benefit | Bond funds (c)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	276	250
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	221	231
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	71	88
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	51	48
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	5	2
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	0
Foreign Pension Plans, Defined Benefit | Level 1 | Equity 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 | Bond funds (c)
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	5	2
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	755	759
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	49	46
Foreign Pension Plans, Defined Benefit | Level 2 | Equity funds (b)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	197	209
Foreign Pension Plans, Defined Benefit | Level 2 | Bond funds (c)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	232	212
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	221	231
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	36	42
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	20	19
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	105	111
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	0
Foreign Pension Plans, Defined Benefit | Level 3 | Equity 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 3 | Bond funds (c)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Fair value of plan assets at end of period	44	38
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	0	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	35	46
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	$ 26	$ 27
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	84.00%