Employee Benefits (Details 2) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014
Change in plan assets - level 3 inputs
Actual gains (losses) on pension and post retirement plan assets		$ 1,307		$ 759
Expected return		668		739
Difference between the actual and expected returns on pension and post-retirement plan assets		639		20
Unfunded Status
Benefit obligation							$ (16,497)	$ (16,714)		$ (16,916)
Non-current portion of unfunded status							(5,178)	(5,527)
Accumulated other comprehensive (loss) income
Total							(1,966)	(2,057)		(1,895)
Recognition of Net Periodic Benefits Expense
Total		(138)		(112)
Deferrals
Total		(47)		(274)
Net Change in AOCI
Total		91		(162)
Health Care and Life Insurance
Active health care benefit expenses		341		399		$ 381
Participating employees' contribution to health care plan		128		127		125
Pension plans
Employee Benefits
Fair value of plan assets		10,892		11,072		12,571	11,060	10,892		11,072	$ 12,571
Investments valued at NAV							5,619	5,564
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		10,892		11,072		12,571
Fair value of plan assets at end of year		11,060		10,892		11,072
Actual gains (losses) on pension and post retirement plan assets		1,306		754		(161)
Expected return		666		732		898
Unfunded Status
Benefit obligation							(13,122)	(13,301)		(13,349)	(15,042)
Fair value of plan assets		10,892		11,072		12,571	11,060	10,892		11,072	12,571
Unfunded status							(2,062)	(2,409)
Current portion of unfunded status							(5)	(6)
Non-current portion of unfunded status							(2,057)	(2,403)
Accumulated other comprehensive (loss) income
Net actuarial (loss) gain							2,892	3,148		2,857
Prior service benefit (cost)							54	62		72
Deferred income tax benefit (expense)							1,107	1,191		1,070
Total							(1,731)	(1,895)		(1,715)
Recognition of Net Periodic Benefits Expense
Net actuarial (loss) gain		205		175
Prior service benefit (cost)		(8)		(8)
Deferred income tax benefit (expense)		(72)		(67)
Total		125		100
Deferrals
Net actuarial (loss) gain		51		(466)
Prior service benefit (cost)		0		(2)
Deferred income tax benefit (expense)		(12)		188
Total		39		(280)
Net Change in AOCI
Net actuarial (loss) gain		256		(291)
Prior service benefit (cost)		(8)		(10)
Defered income tax expense (benefit)		(84)		121
Total		164		(180)
Estimated recognition of net periodic benefit expense in 2018
Net actuarial loss							205
Prior service income (cost)							8
Deferred income tax benefit							48
Estimated net periodic benefit expense to be recorded in 2018 as a component of other comprehensive income (loss)							(149)
Pension plans | Level 3
Employee Benefits
Fair value of plan assets		11		14		14	27	11		14
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		11		14
Net transfers		13		(2)
Acquisitions		5		1
Dispositions				(2)
Fair value of plan assets at end of year		27		11		14
Actual gains (losses) on pension and post retirement plan assets		(2)
Unfunded Status
Fair value of plan assets		11		14		14	27	11		14
Pension plans | Exchange-traded U.S. equity futures
Employee Benefits
Gross notional exposure							256	104
Pension plans | Exchange-traded Treasury and other interest rate futures
Employee Benefits
Gross notional exposure							1,830	1,813
Pension plans | Interest rate swaps
Employee Benefits
Gross notional exposure							137	260
Pension plans | Credit default swaps
Employee Benefits
Gross notional exposure							100	240
Pension plans | Equity swap
Employee Benefits
Gross notional exposure							1	0
Pension plans | Foreign exchange forwards
Employee Benefits
Gross notional exposure							293	778
Pension plans | Options
Employee Benefits
Gross notional exposure							259	206
Pension plans | Investment grade bonds
Employee Benefits
Investments valued at NAV							163	106
Pension plans | High yield bonds
Employee Benefits
Investments valued at NAV							483	521
Pension plans | High yield bonds | Level 3
Employee Benefits
Fair value of plan assets		11		13		13	7	11		13
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		11		13
Net transfers		(1)		(2)
Acquisitions		2		1
Dispositions				(1)
Fair value of plan assets at end of year		7		11		13
Actual gains (losses) on pension and post retirement plan assets		(5)
Unfunded Status
Fair value of plan assets		11		13		13	7	11		13
Pension plans | Emerging market bonds
Employee Benefits
Investments valued at NAV							14	6
Pension plans | Emerging market bonds | Level 3
Employee Benefits
Fair value of plan assets		0		1		1	1	0		1
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		0		1
Net transfers		0		0
Acquisitions		1		0
Dispositions				(1)
Fair value of plan assets at end of year		1		0		1
Actual gains (losses) on pension and post retirement plan assets		0
Unfunded Status
Fair value of plan assets		0		1		1	1	0		1
Pension plans | Diversified strategies
Employee Benefits
Investments valued at NAV							538	522
Pension plans | U.S. stocks
Employee Benefits
Investments valued at NAV							73	58
Pension plans | U.S. stocks | Level 3
Employee Benefits
Fair value of plan assets		0		0		0	3	0		0
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		0		0
Net transfers		0		0
Acquisitions		0		0
Dispositions				0
Fair value of plan assets at end of year		3		0		0
Actual gains (losses) on pension and post retirement plan assets		3
Unfunded Status
Fair value of plan assets		0		0		0	3	0		0
Pension plans | Non-U.S. stocks
Employee Benefits
Investments valued at NAV							627	560
Pension plans | Private debt
Employee Benefits
Investments valued at NAV							374	369
Pension plans | Private debt | Level 3
Employee Benefits
Fair value of plan assets		0		0		0	15	0		0
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		0		0
Net transfers		14		0
Acquisitions		1		0
Dispositions				0
Fair value of plan assets at end of year		15		0		0
Actual gains (losses) on pension and post retirement plan assets		0
Unfunded Status
Fair value of plan assets		0		0		0	15	0		0
Pension plans | Multi-asset strategies
Employee Benefits
Investments valued at NAV							424	412
Pension plans | Emerging market stocks
Employee Benefits
Investments valued at NAV							98	76
Pension plans | Private Equity Funds [Member]
Employee Benefits
Investments valued at NAV							460	506
Pension plans | Market Neutral Hedge Funds
Employee Benefits
Investments valued at NAV							769	739
Pension plans | Directional Hedge Funds
Employee Benefits
Investments valued at NAV							636	657
Pension plans | Real Estate
Employee Benefits
Investments valued at NAV							903	926
Pension plans | Cash equivalents and short-term investment funds
Employee Benefits
Investments valued at NAV							57	106
Pension plans | Cash equivalents and short-term investment funds | Level 3
Employee Benefits
Fair value of plan assets		0		0		0	1	0		0
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		0		0
Net transfers		0		0
Acquisitions		1		0
Dispositions				0
Fair value of plan assets at end of year		1		0		0
Actual gains (losses) on pension and post retirement plan assets		0
Unfunded Status
Fair value of plan assets		0		0		0	1	0		0
Post-Retirement benefit plans
Employee Benefits
Fair value of plan assets		53		193		353	23	53		193	353
Investments valued at NAV							22	41
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		53		193		353
Fair value of plan assets at end of year		23		53		193
Actual gains (losses) on pension and post retirement plan assets		1		5		3
Expected return		2		7		21
Unfunded Status
Benefit obligation							(3,375)	(3,413)		(3,567)	(3,830)
Fair value of plan assets		53		193		$ 353	23	53		193	$ 353
Unfunded status							(3,352)	(3,360)
Current portion of unfunded status							(262)	(236)
Non-current portion of unfunded status							(3,090)	(3,124)
Accumulated other comprehensive (loss) income
Net actuarial (loss) gain							250	137		147
Prior service benefit (cost)							(107)	(127)		(147)
Deferred income tax benefit (expense)							122	102		114
Total							(235)	(162)		$ (180)
Recognition of Net Periodic Benefits Expense
Net actuarial (loss) gain		0		0
Prior service benefit (cost)		20		20
Deferred income tax benefit (expense)		(7)		(8)
Total		13		12
Deferrals
Net actuarial (loss) gain		(113)		10
Prior service benefit (cost)		0		0
Deferred income tax benefit (expense)		27		(4)
Total		(86)		6
Net Change in AOCI
Net actuarial (loss) gain		(113)		10
Prior service benefit (cost)		20		20
Defered income tax expense (benefit)		20		(12)
Total		(73)		18
Estimated recognition of net periodic benefit expense in 2018
Net actuarial loss							0
Prior service income (cost)							(20)
Deferred income tax benefit							4
Estimated net periodic benefit expense to be recorded in 2018 as a component of other comprehensive income (loss)							(16)
Post-Retirement benefit plans | Investment grade bonds
Employee Benefits
Investments valued at NAV							0	0
Post-Retirement benefit plans | High yield bonds
Employee Benefits
Investments valued at NAV							0	1
Post-Retirement benefit plans | Emerging market bonds
Employee Benefits
Investments valued at NAV							0	0
Post-Retirement benefit plans | Diversified strategies
Employee Benefits
Investments valued at NAV							0	1
Post-Retirement benefit plans | U.S. stocks
Employee Benefits
Investments valued at NAV							0	0
Post-Retirement benefit plans | Non-U.S. stocks
Employee Benefits
Investments valued at NAV							0	1
Post-Retirement benefit plans | Private debt
Employee Benefits
Investments valued at NAV							1	1
Post-Retirement benefit plans | Multi-asset strategies
Employee Benefits
Investments valued at NAV							0	0
Post-Retirement benefit plans | Emerging market stocks
Employee Benefits
Investments valued at NAV							0	0
Post-Retirement benefit plans | Private Equity Funds [Member]
Employee Benefits
Investments valued at NAV							10	14
Post-Retirement benefit plans | Market Neutral Hedge Funds
Employee Benefits
Investments valued at NAV							0	1
Post-Retirement benefit plans | Directional Hedge Funds
Employee Benefits
Investments valued at NAV							0	1
Post-Retirement benefit plans | Real Estate
Employee Benefits
Investments valued at NAV							1	8
Post-Retirement benefit plans | Cash equivalents and short-term investment funds
Employee Benefits
Investments valued at NAV							10	13
Qualified plan | Pension plans
Unfunded Status
Unfunded status							(2,004)	(2,352)
Fair Value, Measurements, Recurring [Member] | Pension plans
Employee Benefits
Fair value of plan assets		5,328		5,328			5,441	5,328
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		5,328
Fair value of plan assets at end of year		5,441		5,328
Unfunded Status
Fair value of plan assets		5,328		5,328			5,441	5,328
Fair Value, Measurements, Recurring [Member] | Pension plans | Level 1
Employee Benefits
Fair value of plan assets		2,895		2,895			2,827	2,895
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		2,895
Fair value of plan assets at end of year		2,827		2,895
Unfunded Status
Fair value of plan assets		2,895		2,895			2,827	2,895
Fair Value, Measurements, Recurring [Member] | Pension plans | Level 2
Employee Benefits
Fair value of plan assets		2,422		2,422			2,587	2,422
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		2,422
Fair value of plan assets at end of year		2,587		2,422
Unfunded Status
Fair value of plan assets		2,422		2,422			2,587	2,422
Fair Value, Measurements, Recurring [Member] | Pension plans | Level 3
Employee Benefits
Fair value of plan assets		11		11			27	11
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		11
Fair value of plan assets at end of year		27		11
Unfunded Status
Fair value of plan assets		11		11			27	11
Fair Value, Measurements, Recurring [Member] | Pension plans | Investment grade bonds
Employee Benefits
Fair value of plan assets		1,824	[1]	1,824	[1]		1,747	1,824	[1]
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year	[1]	1,824
Fair value of plan assets at end of year		1,747		1,824	[1]
Unfunded Status
Fair value of plan assets		1,824	[1]	1,824	[1]		1,747	1,824	[1]
Fair Value, Measurements, Recurring [Member] | Pension plans | Investment grade bonds | Level 1
Employee Benefits
Fair value of plan assets		420		420			432	420
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		420
Fair value of plan assets at end of year		432		420
Unfunded Status
Fair value of plan assets		420		420			432	420
Fair Value, Measurements, Recurring [Member] | Pension plans | Investment grade bonds | Level 2
Employee Benefits
Fair value of plan assets		1,404		1,404			1,315	1,404
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		1,404
Fair value of plan assets at end of year		1,315		1,404
Unfunded Status
Fair value of plan assets		1,404		1,404			1,315	1,404
Fair Value, Measurements, Recurring [Member] | Pension plans | Investment grade bonds | Level 3
Employee Benefits
Fair value of plan assets		0		0			0	0
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year		0		0
Unfunded Status
Fair value of plan assets		0		0			0	0
Fair Value, Measurements, Recurring [Member] | Pension plans | High yield bonds
Employee Benefits
Fair value of plan assets		615	[2]	615	[2]		582	615	[2]
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year	[2]	615
Fair value of plan assets at end of year		582		615	[2]
Unfunded Status
Fair value of plan assets		615	[2]	615	[2]		582	615	[2]
Fair Value, Measurements, Recurring [Member] | Pension plans | High yield bonds | Level 1
Employee Benefits
Fair value of plan assets		7		7			0	7
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		7
Fair value of plan assets at end of year		0		7
Unfunded Status
Fair value of plan assets		7		7			0	7
Fair Value, Measurements, Recurring [Member] | Pension plans | High yield bonds | Level 2
Employee Benefits
Fair value of plan assets		597		597			575	597
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		597
Fair value of plan assets at end of year		575		597
Unfunded Status
Fair value of plan assets		597		597			575	597
Fair Value, Measurements, Recurring [Member] | Pension plans | High yield bonds | Level 3
Employee Benefits
Fair value of plan assets		11		11			7	11
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		11
Fair value of plan assets at end of year		7		11
Unfunded Status
Fair value of plan assets		11		11			7	11
Fair Value, Measurements, Recurring [Member] | Pension plans | Emerging market bonds
Employee Benefits
Fair value of plan assets		424	[3]	424	[3]		437	424	[3]
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year	[3]	424
Fair value of plan assets at end of year		437		424	[3]
Unfunded Status
Fair value of plan assets		424	[3]	424	[3]		437	424	[3]
Fair Value, Measurements, Recurring [Member] | Pension plans | Emerging market bonds | Level 1
Employee Benefits
Fair value of plan assets		212		212			217	212
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		212
Fair value of plan assets at end of year		217		212
Unfunded Status
Fair value of plan assets		212		212			217	212
Fair Value, Measurements, Recurring [Member] | Pension plans | Emerging market bonds | Level 2
Employee Benefits
Fair value of plan assets		212		212			219	212
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		212
Fair value of plan assets at end of year		219		212
Unfunded Status
Fair value of plan assets		212		212			219	212
Fair Value, Measurements, Recurring [Member] | Pension plans | Emerging market bonds | Level 3
Employee Benefits
Fair value of plan assets		0		0			1	0
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year		1		0
Unfunded Status
Fair value of plan assets		0		0			1	0
Fair Value, Measurements, Recurring [Member] | Pension plans | U.S. stocks
Employee Benefits
Fair value of plan assets		1,147	[4]	1,147	[4]		1,035	1,147	[4]
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year	[4]	1,147
Fair value of plan assets at end of year		1,035		1,147	[4]
Unfunded Status
Fair value of plan assets		1,147	[4]	1,147	[4]		1,035	1,147	[4]
Fair Value, Measurements, Recurring [Member] | Pension plans | U.S. stocks | Level 1
Employee Benefits
Fair value of plan assets		1,146		1,146			1,030	1,146
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		1,146
Fair value of plan assets at end of year		1,030		1,146
Unfunded Status
Fair value of plan assets		1,146		1,146			1,030	1,146
Fair Value, Measurements, Recurring [Member] | Pension plans | U.S. stocks | Level 2
Employee Benefits
Fair value of plan assets		1		1			2	1
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		1
Fair value of plan assets at end of year		2		1
Unfunded Status
Fair value of plan assets		1		1			2	1
Fair Value, Measurements, Recurring [Member] | Pension plans | U.S. stocks | Level 3
Employee Benefits
Fair value of plan assets		0		0			3	0
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year		3		0
Unfunded Status
Fair value of plan assets		0		0			3	0
Fair Value, Measurements, Recurring [Member] | Pension plans | Non-U.S. stocks
Employee Benefits
Fair value of plan assets		722	[5]	722	[5]		706	722	[5]
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year	[5]	722
Fair value of plan assets at end of year		706		722	[5]
Unfunded Status
Fair value of plan assets		722	[5]	722	[5]		706	722	[5]
Fair Value, Measurements, Recurring [Member] | Pension plans | Non-U.S. stocks | Level 1
Employee Benefits
Fair value of plan assets		721		721			706	721
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		721
Fair value of plan assets at end of year		706		721
Unfunded Status
Fair value of plan assets		721		721			706	721
Fair Value, Measurements, Recurring [Member] | Pension plans | Non-U.S. stocks | Level 2
Employee Benefits
Fair value of plan assets		1		1			0	1
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		1
Fair value of plan assets at end of year		0		1
Unfunded Status
Fair value of plan assets		1		1			0	1
Fair Value, Measurements, Recurring [Member] | Pension plans | Non-U.S. stocks | Level 3
Employee Benefits
Fair value of plan assets		0		0			0	0
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year		0		0
Unfunded Status
Fair value of plan assets		0		0			0	0
Fair Value, Measurements, Recurring [Member] | Pension plans | Private debt
Employee Benefits
Fair value of plan assets		15					15
Change in plan assets - level 3 inputs
Fair value of plan assets at end of year		15
Unfunded Status
Fair value of plan assets		15					15
Fair Value, Measurements, Recurring [Member] | Pension plans | Private debt | Level 1
Employee Benefits
Fair value of plan assets		0					0
Change in plan assets - level 3 inputs
Fair value of plan assets at end of year		0
Unfunded Status
Fair value of plan assets		0					0
Fair Value, Measurements, Recurring [Member] | Pension plans | Private debt | Level 2
Employee Benefits
Fair value of plan assets		0					0
Change in plan assets - level 3 inputs
Fair value of plan assets at end of year		0
Unfunded Status
Fair value of plan assets		0					0
Fair Value, Measurements, Recurring [Member] | Pension plans | Private debt | Level 3
Employee Benefits
Fair value of plan assets		15					15
Change in plan assets - level 3 inputs
Fair value of plan assets at end of year		15
Unfunded Status
Fair value of plan assets		15					15
Fair Value, Measurements, Recurring [Member] | Pension plans | Multi-asset strategies
Employee Benefits
Fair value of plan assets		389		389			440	389
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		389
Fair value of plan assets at end of year		440		389
Unfunded Status
Fair value of plan assets		389		389			440	389
Fair Value, Measurements, Recurring [Member] | Pension plans | Multi-asset strategies | Level 1
Employee Benefits
Fair value of plan assets		389		389			440	389
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		389
Fair value of plan assets at end of year		440		389
Unfunded Status
Fair value of plan assets		389		389			440	389
Fair Value, Measurements, Recurring [Member] | Pension plans | Multi-asset strategies | Level 2
Employee Benefits
Fair value of plan assets		0		0			0	0
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year		0		0
Unfunded Status
Fair value of plan assets		0		0			0	0
Fair Value, Measurements, Recurring [Member] | Pension plans | Multi-asset strategies | Level 3
Employee Benefits
Fair value of plan assets		0		0			0	0
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year		0		0
Unfunded Status
Fair value of plan assets		0		0			0	0
Fair Value, Measurements, Recurring [Member] | Pension plans | Derivative [Member]
Employee Benefits
Fair value of plan assets		2					2
Change in plan assets - level 3 inputs
Fair value of plan assets at end of year		2
Unfunded Status
Fair value of plan assets		2					2
Fair Value, Measurements, Recurring [Member] | Pension plans | Derivative [Member] | Level 1
Employee Benefits
Fair value of plan assets		2					2
Change in plan assets - level 3 inputs
Fair value of plan assets at end of year		2
Unfunded Status
Fair value of plan assets		2					2
Fair Value, Measurements, Recurring [Member] | Pension plans | Derivative [Member] | Level 2
Employee Benefits
Fair value of plan assets		0					0
Change in plan assets - level 3 inputs
Fair value of plan assets at end of year		0
Unfunded Status
Fair value of plan assets		0					0
Fair Value, Measurements, Recurring [Member] | Pension plans | Derivative [Member] | Level 3
Employee Benefits
Fair value of plan assets		0					0
Change in plan assets - level 3 inputs
Fair value of plan assets at end of year		0
Unfunded Status
Fair value of plan assets		0					0
Fair Value, Measurements, Recurring [Member] | Pension plans | Cash equivalents and short-term investment funds
Employee Benefits
Fair value of plan assets		207	[6]	207	[6]		477	207	[6]
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year	[6]	207
Fair value of plan assets at end of year		477		207	[6]
Unfunded Status
Fair value of plan assets		207	[6]	207	[6]		477	207	[6]
Fair Value, Measurements, Recurring [Member] | Pension plans | Cash equivalents and short-term investment funds | Level 1
Employee Benefits
Fair value of plan assets		0		0			0	0
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year		0		0
Unfunded Status
Fair value of plan assets		0		0			0	0
Fair Value, Measurements, Recurring [Member] | Pension plans | Cash equivalents and short-term investment funds | Level 2
Employee Benefits
Fair value of plan assets		207		207			476	207
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		207
Fair value of plan assets at end of year		476		207
Unfunded Status
Fair value of plan assets		207		207			476	207
Fair Value, Measurements, Recurring [Member] | Pension plans | Cash equivalents and short-term investment funds | Level 3
Employee Benefits
Fair value of plan assets		0		0			1	0
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year		1		0
Unfunded Status
Fair value of plan assets		0		0			1	0
Fair Value, Measurements, Recurring [Member] | Post-Retirement benefit plans
Employee Benefits
Fair value of plan assets		12		12			1	12
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		12
Fair value of plan assets at end of year		1		12
Unfunded Status
Fair value of plan assets		12		12			1	12
Fair Value, Measurements, Recurring [Member] | Post-Retirement benefit plans | Level 1
Employee Benefits
Fair value of plan assets		4		4			1	4
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		4
Fair value of plan assets at end of year		1		4
Unfunded Status
Fair value of plan assets		4		4			1	4
Fair Value, Measurements, Recurring [Member] | Post-Retirement benefit plans | Level 2
Employee Benefits
Fair value of plan assets		8		8			0	8
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		8
Fair value of plan assets at end of year		0		8
Unfunded Status
Fair value of plan assets		8		8			0	8
Fair Value, Measurements, Recurring [Member] | Post-Retirement benefit plans | Level 3
Employee Benefits
Fair value of plan assets		0		0			0	0
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year		0		0
Unfunded Status
Fair value of plan assets		0		0			0	0
Fair Value, Measurements, Recurring [Member] | Post-Retirement benefit plans | Investment grade bonds
Employee Benefits
Fair value of plan assets		3		3			0	3
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		3
Fair value of plan assets at end of year		0		3
Unfunded Status
Fair value of plan assets		3		3			0	3
Fair Value, Measurements, Recurring [Member] | Post-Retirement benefit plans | Investment grade bonds | Level 1
Employee Benefits
Fair value of plan assets		1		1			0	1
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		1
Fair value of plan assets at end of year		0		1
Unfunded Status
Fair value of plan assets		1		1			0	1
Fair Value, Measurements, Recurring [Member] | Post-Retirement benefit plans | Investment grade bonds | Level 2
Employee Benefits
Fair value of plan assets		2		2			0	2
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		2
Fair value of plan assets at end of year		0		2
Unfunded Status
Fair value of plan assets		2		2			0	2
Fair Value, Measurements, Recurring [Member] | Post-Retirement benefit plans | Investment grade bonds | Level 3
Employee Benefits
Fair value of plan assets		0		0			0	0
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year		0		0
Unfunded Status
Fair value of plan assets		0		0			0	0
Fair Value, Measurements, Recurring [Member] | Post-Retirement benefit plans | High yield bonds
Employee Benefits
Fair value of plan assets		1		1			0	1
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		1
Fair value of plan assets at end of year		0		1
Unfunded Status
Fair value of plan assets		1		1			0	1
Fair Value, Measurements, Recurring [Member] | Post-Retirement benefit plans | High yield bonds | Level 1
Employee Benefits
Fair value of plan assets		0		0			0	0
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year		0		0
Unfunded Status
Fair value of plan assets		0		0			0	0
Fair Value, Measurements, Recurring [Member] | Post-Retirement benefit plans | High yield bonds | Level 2
Employee Benefits
Fair value of plan assets		1		1			0	1
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		1
Fair value of plan assets at end of year		0		1
Unfunded Status
Fair value of plan assets		1		1			0	1
Fair Value, Measurements, Recurring [Member] | Post-Retirement benefit plans | High yield bonds | Level 3
Employee Benefits
Fair value of plan assets		0		0			0	0
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year		0		0
Unfunded Status
Fair value of plan assets		0		0			0	0
Fair Value, Measurements, Recurring [Member] | Post-Retirement benefit plans | U.S. stocks
Employee Benefits
Fair value of plan assets		2		2			1	2
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		2
Fair value of plan assets at end of year		1		2
Unfunded Status
Fair value of plan assets		2		2			1	2
Fair Value, Measurements, Recurring [Member] | Post-Retirement benefit plans | U.S. stocks | Level 1
Employee Benefits
Fair value of plan assets		2		2			1	2
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		2
Fair value of plan assets at end of year		1		2
Unfunded Status
Fair value of plan assets		2		2			1	2
Fair Value, Measurements, Recurring [Member] | Post-Retirement benefit plans | U.S. stocks | Level 2
Employee Benefits
Fair value of plan assets		0		0			0	0
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year		0		0
Unfunded Status
Fair value of plan assets		0		0			0	0
Fair Value, Measurements, Recurring [Member] | Post-Retirement benefit plans | U.S. stocks | Level 3
Employee Benefits
Fair value of plan assets		0		0			0	0
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year		0		0
Unfunded Status
Fair value of plan assets		0		0			0	0
Fair Value, Measurements, Recurring [Member] | Post-Retirement benefit plans | Non-U.S. stocks
Employee Benefits
Fair value of plan assets		1		1			0	1
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		1
Fair value of plan assets at end of year		0		1
Unfunded Status
Fair value of plan assets		1		1			0	1
Fair Value, Measurements, Recurring [Member] | Post-Retirement benefit plans | Non-U.S. stocks | Level 1
Employee Benefits
Fair value of plan assets		1		1			0	1
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		1
Fair value of plan assets at end of year		0		1
Unfunded Status
Fair value of plan assets		1		1			0	1
Fair Value, Measurements, Recurring [Member] | Post-Retirement benefit plans | Non-U.S. stocks | Level 2
Employee Benefits
Fair value of plan assets		0		0			0	0
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year		0		0
Unfunded Status
Fair value of plan assets		0		0			0	0
Fair Value, Measurements, Recurring [Member] | Post-Retirement benefit plans | Non-U.S. stocks | Level 3
Employee Benefits
Fair value of plan assets		0		0			0	0
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year		0		0
Unfunded Status
Fair value of plan assets		0		0			0	0
Fair Value, Measurements, Recurring [Member] | Post-Retirement benefit plans | Cash equivalents and short-term investment funds
Employee Benefits
Fair value of plan assets		5		5			0	5
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		5
Fair value of plan assets at end of year		0		5
Unfunded Status
Fair value of plan assets		5		5			0	5
Fair Value, Measurements, Recurring [Member] | Post-Retirement benefit plans | Cash equivalents and short-term investment funds | Level 1
Employee Benefits
Fair value of plan assets		0		0			0	0
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year		0		0
Unfunded Status
Fair value of plan assets		0		0			0	0
Fair Value, Measurements, Recurring [Member] | Post-Retirement benefit plans | Cash equivalents and short-term investment funds | Level 2
Employee Benefits
Fair value of plan assets		5		5			0	5
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		5
Fair value of plan assets at end of year		0		5
Unfunded Status
Fair value of plan assets		5		5			0	5
Fair Value, Measurements, Recurring [Member] | Post-Retirement benefit plans | Cash equivalents and short-term investment funds | Level 3
Employee Benefits
Fair value of plan assets		0		0			0	0
Change in plan assets - level 3 inputs
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year		0		0
Unfunded Status
Fair value of plan assets		$ 0		$ 0			$ 0	$ 0

[1] Investment grade bonds represent investments in fixed income securities as well as commingled bond funds comprised of U.S. Treasury securities, agencies, corporate bonds, mortgage-backed securities, asset-backed securities and commercial mortgage-backed securities. Treasury securities are valued at the bid price reported in the active market in which the security is traded and are classified as Level 1. The valuation inputs of other investment grade bonds primarily utilize observable market information and are based on a spread to U.S. Treasury securities and consider yields available on comparable securities of issuers with similar credit ratings. The primary observable inputs include references to the new issue market for similar securities, the secondary trading markets and dealer quotes. Option adjusted spread models are utilized to evaluate securities such as asset backed securities that have early redemption features. These securities are classified as Level 2. The commingled funds are valued at NAV based on the market value of the underlying fixed income securities using the same valuation inputs previously described.

[2] High yield bonds represent investments in below investment grade fixed income securities as well as commingled high yield bond funds. The valuation inputs for the securities primarily utilize observable market information and are based on a spread to U.S. Treasury securities and consider yields available on comparable securities of issuers with similar credit ratings. These securities are primarily classified as Level 2. Securities whose valuation inputs are not based on observable market information are classified as Level 3. The commingled funds are valued at NAV based on the market value of the underlying high yield instruments using the same valuation inputs previously described.

[3] Emerging market bonds represent investments in securities issued by governments and other entities located in developing countries as well as registered mutual funds and commingled emerging market bond funds. The valuation inputs for the securities utilize observable market information and are primarily based on dealer quotes or a spread relative to the local government bonds. The registered mutual fund is classified as Level 1 while individual securities are primarily classified as Level 2. Securities whose valuation inputs are not based on observable market information are classified as Level 3. The commingled funds are valued at NAV based on the market value of the underlying emerging market bonds using the same valuation inputs previously described.

[4] U.S. stocks represent investments in stocks of U.S. based companies as well as commingled U.S. stock funds. The valuation inputs for U.S. stocks are based on the last published price reported on the major stock market on which the securities are traded and are primarily classified as Level 1. Securities whose valuation inputs are not based on observable market information are classified as Level 3. The commingled funds are valued at NAV based on the market value of the underlying investments using the same valuation inputs previously described.

[5] Non-U.S. stocks represent investments in stocks of companies based in developed countries outside the U.S. as well as commingled funds. The valuation inputs for non-U.S. stocks are based on the last published price reported on the major stock market on which the securities are traded and are primarily classified as Level 1. The commingled funds are valued at NAV based on the market value of the underlying investments using the same valuation inputs previously described.

[6] Cash equivalents and short-term investments represent investments that are used in conjunction with derivatives positions or are used to provide liquidity for the payment of benefits or other purposes. The valuation inputs of securities are based on a spread to U.S. Treasury Bills, the Federal Funds Rate, or London Interbank Offered Rate and consider yields available on comparable securities of issuers with similar credit ratings and are primarily classified as Level 2. The commingled funds are valued at NAV based on the market value of the underlying investments using the same valuation inputs described above.