Retirement Plans and Profit Sharing Arrangements (Assets Measured at Fair Value) (Details 6) - Pension Plans [Member] - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 608	$ 612	$ 544
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	214	215
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	357	362
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	37	35
Total [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	608	612
U.S. large cap stocks [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	74	74
U.S. large cap stocks [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	83	84
U.S. large cap stocks [Member] | Total [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	157	158
U.S. small cap stocks [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	55	59
U.S. small cap stocks [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3	1
U.S. small cap stocks [Member] | Total [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	58	60
Non-U.S. large cap stocks [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21	21
Non-U.S. large cap stocks [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	34	33
Non-U.S. large cap stocks [Member] | Total [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	55	54
Non-U.S. small cap stocks [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21	18
Non-U.S. small cap stocks [Member] | Total [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21	18
Emerging markets [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14	15
Emerging markets [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21	24
Emerging markets [Member] | Total [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	35	39
U.S. investment grade bonds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	19	19
U.S. investment grade bonds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14	15
U.S. investment grade bonds [Member] | Total [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	33	34
U.S. high yield bonds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	26	27
U.S. high yield bonds [Member] | Total [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	26	27
Non-U.S. investment grade bonds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14	15
Non-U.S. investment grade bonds [Member] | Total [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14	15
Real estate investment trusts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	16	14	2	$ 12
Real estate investment trusts [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	16	14
Real estate investment trusts [Member] | Total [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	16	14
Hedge funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21	21	$ 20	$ 18
Hedge funds [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21	21
Hedge funds [Member] | Total [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21	21
Pooled pension funds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	143	144
Pooled pension funds [Member] | Total [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	143	144
AVC assets (pooled pension funds) [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	19	19
AVC assets (pooled pension funds) [Member] | Total [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	19	19
Cash equivalents [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10	9
Cash equivalents [Member] | Total [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 10	$ 9