Employee Benefits (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2014		Dec. 31, 2011
Actual return on plan assets:
Actual gains on pension and post retirement plan assets	$ 1,410		$ 855
Expected return	924		935
Difference between the actual and expected returns on pension and post-retirement plan assets	486		80
Unfunded Status
Benefit obligation	(18,872)		(17,089)		(18,956)
Non-current portion of unfunded status	(5,808)		(4,049)
Accumulated other comprehensive (loss) income at the beginning of the period
Total	1,992		791
Recognition of Net Periodic Benefits Expense
Net periodic (income) expense	68
Deferrals
Total	(1,269)
Net Change in AOCI
Total	(1,201)
Accumulated other comprehensive (loss) income at the end of the period
Total	1,992		791
Health Care and Life Insurance
Active health care benefit expenses	381		362		360
Participating employees' contribution to health care plan	136		117		113
Pension Plans
Employee Benefits
Defined Benefit Plan, Amortization of Gain (Loss), Including Settlements	85
Total investments	12,571		12,346
Total plan assets	12,571		12,346		12,321
Change in plan assets
Fair value of plan assets at beginning of year	12,346		12,321		11,814
Actual return on plan assets:
Fair value of plan assets at end of year	12,571		12,346		12,321
Actual gains on pension and post retirement plan assets	1,373		810		1,476
Expected return	891		896		847
Unfunded Status
Benefit obligation	(15,042)		(13,401)		(14,881)			(13,596)
Fair value of plan assets	12,571		12,346		12,321
Unfunded status	(2,471)		(1,055)
Current portion of unfunded status	(6)		(5)
Non-current portion of unfunded status	(2,465)		(1,050)
Accumulated other comprehensive (loss) income at the beginning of the period
Net actuarial (loss) gain	(2,760)		(1,058)
Prior service (cost) benefit	33					32
Deferred income tax benefit (expense)	(1,072)		(422)
Total	1,720		669
Recognition of Net Periodic Benefits Expense
Net actuarial (loss) gain	22		84		35
Prior service (cost) benefit	(5)		(5)		(4)
Deferred income tax benefit (expense)	(34)
Net periodic (income) expense	56
Deferrals
Net actuarial (loss) gain	(1,787)
Prior service (cost) benefit	(4)
Deferred income tax benefit (expense)	684
Total	(1,107)
Net Change in AOCI
Net actuarial (loss) gain	(1,702)
Prior service (cost) benefit	1
Deferred income tax benefit (expense)	650
Total	(1,051)
Accumulated other comprehensive (loss) income at the end of the period
Net actuarial (loss) gain	(2,760)		(1,058)
Prior service (cost) benefit	33					32
Deferred income tax benefit (expense)	(1,072)		(422)
Total	1,720		669
Estimated recognition of net periodic benefit expense in 2013:
Net actuarial loss	(148)
Prior service cost	(5)
Deferred income tax benefit	58
Total	(95)
Pension Plans | Level 1
Employee Benefits
Total investments	3,779		3,576			3,779
Pension Plans | Level 2
Employee Benefits
Total investments	7,347		7,191			7,347
Pension Plans | Level 3
Employee Benefits
Total investments	1,445		1,579
Total plan assets	1,445		1,579
Change in plan assets
Fair value of plan assets at beginning of year	1,579		1,766
Net transfers	6		(165)
Acquisitions	253		267
Dispositions	434		464
Actual return on plan assets:
Gains relating to assets sold during the year	151		109
(Losses) gains relating to assets still held at year-end	(110)		66
Fair value of plan assets at end of year	1,445		1,579
Unfunded Status
Fair value of plan assets	1,445		1,579
Pension Plans | Exchange-traded U.S. equity futures
Employee Benefits
Gross notional exposure	134		95			134
Pension Plans | Exchange-traded non-U.S. equity futures
Employee Benefits
Gross notional exposure	0		0			0
Pension Plans | Exchange-traded Treasury futures
Employee Benefits
Gross notional exposure	2,451		3,011			2,451
Pension Plans | Interest rate swaps
Employee Benefits
Gross notional exposure	579		556			579
Pension Plans | Credit default swaps
Employee Benefits
Gross notional exposure	382		253			382
Pension Plans | Foreign exchange forwards
Employee Benefits
Gross notional exposure	1,195		938			1,195
Pension Plans | Options
Employee Benefits
Gross notional exposure	529		261			529
Pension Plans | Investment grade bonds
Employee Benefits
Total plan assets	2,493	[1]	2,317	[1]		2,493	[1]
Change in plan assets
Fair value of plan assets at beginning of year						2,493	[1]
Actual return on plan assets:
Fair value of plan assets at end of year	2,493	[1]	2,317	[1]		2,493	[1]
Unfunded Status
Fair value of plan assets	2,493	[1]	2,317	[1]		2,493	[1]
Pension Plans | Investment grade bonds | Level 1
Employee Benefits
Total plan assets	1,013	[1]	813	[1]		1,013	[1]
Change in plan assets
Fair value of plan assets at beginning of year						1,013	[1]
Actual return on plan assets:
Fair value of plan assets at end of year	1,013	[1]	813	[1]		1,013	[1]
Unfunded Status
Fair value of plan assets	1,013	[1]	813	[1]		1,013	[1]
Pension Plans | Investment grade bonds | Level 2
Employee Benefits
Total plan assets	1,480	[1]	1,504	[1]		1,480	[1]
Change in plan assets
Fair value of plan assets at beginning of year						1,480	[1]
Actual return on plan assets:
Fair value of plan assets at end of year	1,480	[1]	1,504	[1]		1,480	[1]
Unfunded Status
Fair value of plan assets	1,480	[1]	1,504	[1]		1,480	[1]
Pension Plans | Investment grade bonds | Level 3
Employee Benefits
Total plan assets	0	[1]	0	[1]		0	[1]
Change in plan assets
Fair value of plan assets at beginning of year						0	[1]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[1]	0	[1]		0	[1]
Unfunded Status
Fair value of plan assets	0	[1]	0	[1]		0	[1]
Pension Plans | High Yield Bonds
Employee Benefits
Total plan assets	1,513	[2]	1,291	[2]		1,513	[2]
Change in plan assets
Fair value of plan assets at beginning of year						1,513	[2]
Actual return on plan assets:
Fair value of plan assets at end of year	1,513	[2]	1,291	[2]		1,513	[2]
Unfunded Status
Fair value of plan assets	1,513	[2]	1,291	[2]		1,513	[2]
Pension Plans | High Yield Bonds | Level 1
Employee Benefits
Total plan assets	0	[2]	0	[2]		0	[2]
Change in plan assets
Fair value of plan assets at beginning of year						0	[2]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[2]	0	[2]		0	[2]
Unfunded Status
Fair value of plan assets	0	[2]	0	[2]		0	[2]
Pension Plans | High Yield Bonds | Level 2
Employee Benefits
Total plan assets	1,480	[2]	1,265	[2]		1,480	[2]
Change in plan assets
Fair value of plan assets at beginning of year						1,480	[2]
Actual return on plan assets:
Fair value of plan assets at end of year	1,480	[2]	1,265	[2]		1,480	[2]
Unfunded Status
Fair value of plan assets	1,480	[2]	1,265	[2]		1,480	[2]
Pension Plans | High Yield Bonds | Level 3
Employee Benefits
Total plan assets	33	[2]	26	[2]
Change in plan assets
Fair value of plan assets at beginning of year	26	[2]	59
Net transfers	6		0
Acquisitions	14		5
Dispositions	16		43
Actual return on plan assets:
Gains relating to assets sold during the year	8		12
(Losses) gains relating to assets still held at year-end	(5)		(7)
Fair value of plan assets at end of year	33	[2]	26	[2]
Unfunded Status
Fair value of plan assets	33	[2]	26	[2]
Pension Plans | Emerging market bonds
Employee Benefits
Total plan assets	642	[3]	563	[3]		642	[3]
Change in plan assets
Fair value of plan assets at beginning of year						642	[3]
Actual return on plan assets:
Fair value of plan assets at end of year	642	[3]	563	[3]		642	[3]
Unfunded Status
Fair value of plan assets	642	[3]	563	[3]		642	[3]
Pension Plans | Emerging market bonds | Level 1
Employee Benefits
Total plan assets	208	[3]	196	[3]		208	[3]
Change in plan assets
Fair value of plan assets at beginning of year						208	[3]
Actual return on plan assets:
Fair value of plan assets at end of year	208	[3]	196	[3]		208	[3]
Unfunded Status
Fair value of plan assets	208	[3]	196	[3]		208	[3]
Pension Plans | Emerging market bonds | Level 2
Employee Benefits
Total plan assets	434	[3]	367	[3]		434	[3]
Change in plan assets
Fair value of plan assets at beginning of year						434	[3]
Actual return on plan assets:
Fair value of plan assets at end of year	434	[3]	367	[3]		434	[3]
Unfunded Status
Fair value of plan assets	434	[3]	367	[3]		434	[3]
Pension Plans | Emerging market bonds | Level 3
Employee Benefits
Total plan assets	0	[3]	0	[3]		0	[3]
Change in plan assets
Fair value of plan assets at beginning of year						0	[3]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[3]	0	[3]		0	[3]
Unfunded Status
Fair value of plan assets	0	[3]	0	[3]		0	[3]
Pension Plans | Convertible bonds
Employee Benefits
Total plan assets	14	[4]	389	[4]		14	[4]
Change in plan assets
Fair value of plan assets at beginning of year						14	[4]
Actual return on plan assets:
Fair value of plan assets at end of year	14	[4]	389	[4]		14	[4]
Unfunded Status
Fair value of plan assets	14	[4]	389	[4]		14	[4]
Pension Plans | Convertible bonds | Level 1
Employee Benefits
Total plan assets	0	[4]	0	[4]		0	[4]
Change in plan assets
Fair value of plan assets at beginning of year						0	[4]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[4]	0	[4]		0	[4]
Unfunded Status
Fair value of plan assets	0	[4]	0	[4]		0	[4]
Pension Plans | Convertible bonds | Level 2
Employee Benefits
Total plan assets	14	[4]	389	[4]		14	[4]
Change in plan assets
Fair value of plan assets at beginning of year						14	[4]
Actual return on plan assets:
Fair value of plan assets at end of year	14	[4]	389	[4]		14	[4]
Unfunded Status
Fair value of plan assets	14	[4]	389	[4]		14	[4]
Pension Plans | Convertible bonds | Level 3
Employee Benefits
Total plan assets	0	[4]	0	[4]		0	[4]
Change in plan assets
Fair value of plan assets at beginning of year						0	[4]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[4]	0	[4]		0	[4]
Unfunded Status
Fair value of plan assets	0	[4]	0	[4]		0	[4]
Pension Plans | Diversified strategies
Employee Benefits
Total plan assets	718	[5]	723	[5]		718	[5]
Change in plan assets
Fair value of plan assets at beginning of year						718	[5]
Actual return on plan assets:
Fair value of plan assets at end of year	718	[5]	723	[5]		718	[5]
Unfunded Status
Fair value of plan assets	718	[5]	723	[5]		718	[5]
Pension Plans | Diversified strategies | Level 1
Employee Benefits
Total plan assets	0	[5]	0	[5]		0	[5]
Change in plan assets
Fair value of plan assets at beginning of year						0	[5]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[5]	0	[5]		0	[5]
Unfunded Status
Fair value of plan assets	0	[5]	0	[5]		0	[5]
Pension Plans | Diversified strategies | Level 2
Employee Benefits
Total plan assets	718	[5]	723	[5]		718	[5]
Change in plan assets
Fair value of plan assets at beginning of year						718	[5]
Actual return on plan assets:
Fair value of plan assets at end of year	718	[5]	723	[5]		718	[5]
Unfunded Status
Fair value of plan assets	718	[5]	723	[5]		718	[5]
Pension Plans | Diversified strategies | Level 3
Employee Benefits
Total plan assets	0	[5]	0	[5]		0	[5]
Change in plan assets
Fair value of plan assets at beginning of year						0	[5]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[5]	0	[5]		0	[5]
Unfunded Status
Fair value of plan assets	0	[5]	0	[5]		0	[5]
Pension Plans | U.S. stocks
Employee Benefits
Total plan assets	1,476	[6]	1,500	[6]		1,476	[6]
Change in plan assets
Fair value of plan assets at beginning of year						1,476	[6]
Actual return on plan assets:
Fair value of plan assets at end of year	1,476	[6]	1,500	[6]		1,476	[6]
Unfunded Status
Fair value of plan assets	1,476	[6]	1,500	[6]		1,476	[6]
Pension Plans | U.S. stocks | Level 1
Employee Benefits
Total plan assets	1,389	[6]	1,408	[6]		1,389	[6]
Change in plan assets
Fair value of plan assets at beginning of year						1,389	[6]
Actual return on plan assets:
Fair value of plan assets at end of year	1,389	[6]	1,408	[6]		1,389	[6]
Unfunded Status
Fair value of plan assets	1,389	[6]	1,408	[6]		1,389	[6]
Pension Plans | U.S. stocks | Level 2
Employee Benefits
Total plan assets	87	[6]	92	[6]		87	[6]
Change in plan assets
Fair value of plan assets at beginning of year						87	[6]
Actual return on plan assets:
Fair value of plan assets at end of year	87	[6]	92	[6]		87	[6]
Unfunded Status
Fair value of plan assets	87	[6]	92	[6]		87	[6]
Pension Plans | U.S. stocks | Level 3
Employee Benefits
Total plan assets	0	[6]	0	[6]		0	[6]
Change in plan assets
Fair value of plan assets at beginning of year						0	[6]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[6]	0	[6]		0	[6]
Unfunded Status
Fair value of plan assets	0	[6]	0	[6]		0	[6]
Pension Plans | Non-U.S. stocks
Employee Benefits
Total plan assets	1,553	[7]	1,458	[7]		1,553	[7]
Change in plan assets
Fair value of plan assets at beginning of year						1,553	[7]
Actual return on plan assets:
Fair value of plan assets at end of year	1,553	[7]	1,458	[7]		1,553	[7]
Unfunded Status
Fair value of plan assets	1,553	[7]	1,458	[7]		1,553	[7]
Pension Plans | Non-U.S. stocks | Level 1
Employee Benefits
Total plan assets	1,169	[7]	1,159	[7]		1,169	[7]
Change in plan assets
Fair value of plan assets at beginning of year						1,169	[7]
Actual return on plan assets:
Fair value of plan assets at end of year	1,169	[7]	1,159	[7]		1,169	[7]
Unfunded Status
Fair value of plan assets	1,169	[7]	1,159	[7]		1,169	[7]
Pension Plans | Non-U.S. stocks | Level 2
Employee Benefits
Total plan assets	384	[7]	299	[7]		384	[7]
Change in plan assets
Fair value of plan assets at beginning of year						384	[7]
Actual return on plan assets:
Fair value of plan assets at end of year	384	[7]	299	[7]		384	[7]
Unfunded Status
Fair value of plan assets	384	[7]	299	[7]		384	[7]
Pension Plans | Non-U.S. stocks | Level 3
Employee Benefits
Total plan assets	0	[7]	0	[7]		0	[7]
Change in plan assets
Fair value of plan assets at beginning of year						0	[7]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[7]	0	[7]		0	[7]
Unfunded Status
Fair value of plan assets	0	[7]	0	[7]		0	[7]
Pension Plans | Emerging market stocks
Employee Benefits
Total plan assets	102	[8]	110	[8]		102	[8]
Change in plan assets
Fair value of plan assets at beginning of year						102	[8]
Actual return on plan assets:
Fair value of plan assets at end of year	102	[8]	110	[8]		102	[8]
Unfunded Status
Fair value of plan assets	102	[8]	110	[8]		102	[8]
Pension Plans | Emerging market stocks | Level 1
Employee Benefits
Total plan assets	0	[8]	0	[8]		0	[8]
Change in plan assets
Fair value of plan assets at beginning of year						0	[8]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[8]	0	[8]		0	[8]
Unfunded Status
Fair value of plan assets	0	[8]	0	[8]		0	[8]
Pension Plans | Emerging market stocks | Level 2
Employee Benefits
Total plan assets	102	[8]	110	[8]		102	[8]
Change in plan assets
Fair value of plan assets at beginning of year						102	[8]
Actual return on plan assets:
Fair value of plan assets at end of year	102	[8]	110	[8]		102	[8]
Unfunded Status
Fair value of plan assets	102	[8]	110	[8]		102	[8]
Pension Plans | Emerging market stocks | Level 3
Employee Benefits
Total plan assets	0	[8]	0	[8]		0	[8]
Change in plan assets
Fair value of plan assets at beginning of year						0	[8]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[8]	0	[8]		0	[8]
Unfunded Status
Fair value of plan assets	0	[8]	0	[8]		0	[8]
Pension Plans | Private Equity
Employee Benefits
Total plan assets	673	[9]	721	[9]		673	[9]
Change in plan assets
Fair value of plan assets at beginning of year						673	[9]
Actual return on plan assets:
Fair value of plan assets at end of year	673	[9]	721	[9]		673	[9]
Unfunded Status
Fair value of plan assets	673	[9]	721	[9]		673	[9]
Pension Plans | Private Equity | Level 1
Employee Benefits
Total plan assets	0	[9]	0	[9]		0	[9]
Change in plan assets
Fair value of plan assets at beginning of year						0	[9]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[9]	0	[9]		0	[9]
Unfunded Status
Fair value of plan assets	0	[9]	0	[9]		0	[9]
Pension Plans | Private Equity | Level 2
Employee Benefits
Total plan assets	0	[9]	0	[9]		0	[9]
Change in plan assets
Fair value of plan assets at beginning of year						0	[9]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[9]	0	[9]		0	[9]
Unfunded Status
Fair value of plan assets	0	[9]	0	[9]		0	[9]
Pension Plans | Private Equity | Level 3
Employee Benefits
Total plan assets	673	[9]	721	[9]
Change in plan assets
Fair value of plan assets at beginning of year	721	[9]	711
Net transfers	4		0
Acquisitions	125		82
Dispositions	246		179
Actual return on plan assets:
Gains relating to assets sold during the year	115		68
(Losses) gains relating to assets still held at year-end	(46)		39
Fair value of plan assets at end of year	673	[9]	721	[9]
Unfunded Status
Fair value of plan assets	673	[9]	721	[9]
Pension Plans | Private Debt
Employee Benefits
Total plan assets	395	[10]	436	[10]		395	[10]
Change in plan assets
Fair value of plan assets at beginning of year						395	[10]
Actual return on plan assets:
Fair value of plan assets at end of year	395	[10]	436	[10]		395	[10]
Unfunded Status
Fair value of plan assets	395	[10]	436	[10]		395	[10]
Pension Plans | Private Debt | Level 1
Employee Benefits
Total plan assets	0	[10]	0	[10]		0	[10]
Change in plan assets
Fair value of plan assets at beginning of year						0	[10]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[10]	0	[10]		0	[10]
Unfunded Status
Fair value of plan assets	0	[10]	0	[10]		0	[10]
Pension Plans | Private Debt | Level 2
Employee Benefits
Total plan assets	0	[10]	0	[10]		0	[10]
Change in plan assets
Fair value of plan assets at beginning of year						0	[10]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[10]	0	[10]		0	[10]
Unfunded Status
Fair value of plan assets	0	[10]	0	[10]		0	[10]
Pension Plans | Private Debt | Level 3
Employee Benefits
Total plan assets	395	[10]	436	[10]
Change in plan assets
Fair value of plan assets at beginning of year	436	[10]	465
Net transfers	0		0
Acquisitions	109		71
Dispositions	111		144
Actual return on plan assets:
Gains relating to assets sold during the year	25		18
(Losses) gains relating to assets still held at year-end	(64)		26
Fair value of plan assets at end of year	395	[10]	436	[10]
Unfunded Status
Fair value of plan assets	395	[10]	436	[10]
Pension Plans | Market Neutral Hedge Funds
Employee Benefits
Total plan assets	1,028	[11]	966	[11]		1,028	[11]
Change in plan assets
Fair value of plan assets at beginning of year						1,028	[11]
Actual return on plan assets:
Fair value of plan assets at end of year	1,028	[11]	966	[11]		1,028	[11]
Unfunded Status
Fair value of plan assets	1,028	[11]	966	[11]		1,028	[11]
Pension Plans | Market Neutral Hedge Funds | Level 1
Employee Benefits
Total plan assets	0	[11]	0	[11]		0	[11]
Change in plan assets
Fair value of plan assets at beginning of year						0	[11]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[11]	0	[11]		0	[11]
Unfunded Status
Fair value of plan assets	0	[11]	0	[11]		0	[11]
Pension Plans | Market Neutral Hedge Funds | Level 2
Employee Benefits
Total plan assets	928	[11]	867	[11]		928	[11]
Change in plan assets
Fair value of plan assets at beginning of year						928	[11]
Actual return on plan assets:
Fair value of plan assets at end of year	928	[11]	867	[11]		928	[11]
Unfunded Status
Fair value of plan assets	928	[11]	867	[11]		928	[11]
Pension Plans | Market Neutral Hedge Funds | Level 3
Employee Benefits
Total plan assets	100	[11]	99	[11]
Change in plan assets
Fair value of plan assets at beginning of year	99	[11]	0
Net transfers	0		0
Acquisitions	0		100
Dispositions	0		0
Actual return on plan assets:
Gains relating to assets sold during the year	0		0
(Losses) gains relating to assets still held at year-end	1		(1)
Fair value of plan assets at end of year	100	[11]	99	[11]
Unfunded Status
Fair value of plan assets	100	[11]	99	[11]
Pension Plans | Directional Hedge Funds
Employee Benefits
Total plan assets	558	[11]	614	[11]		558	[11]
Change in plan assets
Fair value of plan assets at beginning of year						558	[11]
Actual return on plan assets:
Fair value of plan assets at end of year	558	[11]	614	[11]		558	[11]
Unfunded Status
Fair value of plan assets	558	[11]	614	[11]		558	[11]
Pension Plans | Directional Hedge Funds | Level 1
Employee Benefits
Total plan assets	0	[11]	0	[11]		0	[11]
Change in plan assets
Fair value of plan assets at beginning of year						0	[11]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[11]	0	[11]		0	[11]
Unfunded Status
Fair value of plan assets	0	[11]	0	[11]		0	[11]
Pension Plans | Directional Hedge Funds | Level 2
Employee Benefits
Total plan assets	530	[11]	582	[11]		530	[11]
Change in plan assets
Fair value of plan assets at beginning of year						530	[11]
Actual return on plan assets:
Fair value of plan assets at end of year	530	[11]	582	[11]		530	[11]
Unfunded Status
Fair value of plan assets	530	[11]	582	[11]		530	[11]
Pension Plans | Directional Hedge Funds | Level 3
Employee Benefits
Total plan assets	28	[11]	32	[11]
Change in plan assets
Fair value of plan assets at beginning of year	32	[11]	194
Net transfers	0		(165)
Acquisitions	0		0
Dispositions	0		1
Actual return on plan assets:
Gains relating to assets sold during the year	0		0
(Losses) gains relating to assets still held at year-end	(4)		4
Fair value of plan assets at end of year	28	[11]	32	[11]
Unfunded Status
Fair value of plan assets	28	[11]	32	[11]
Pension Plans | Real Estate
Employee Benefits
Total plan assets	699	[12]	571	[12]		699	[12]
Change in plan assets
Fair value of plan assets at beginning of year						699	[12]
Actual return on plan assets:
Fair value of plan assets at end of year	699	[12]	571	[12]		699	[12]
Unfunded Status
Fair value of plan assets	699	[12]	571	[12]		699	[12]
Pension Plans | Real Estate | Level 1
Employee Benefits
Total plan assets	0	[12]	0	[12]		0	[12]
Change in plan assets
Fair value of plan assets at beginning of year						0	[12]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[12]	0	[12]		0	[12]
Unfunded Status
Fair value of plan assets	0	[12]	0	[12]		0	[12]
Pension Plans | Real Estate | Level 2
Employee Benefits
Total plan assets	483	[12]	306	[12]		483	[12]
Change in plan assets
Fair value of plan assets at beginning of year						483	[12]
Actual return on plan assets:
Fair value of plan assets at end of year	483	[12]	306	[12]		483	[12]
Unfunded Status
Fair value of plan assets	483	[12]	306	[12]		483	[12]
Pension Plans | Real Estate | Level 3
Employee Benefits
Total plan assets	216	[12]	265	[12]
Change in plan assets
Fair value of plan assets at beginning of year	265	[12]	337
Net transfers	(4)		0
Acquisitions	5		9
Dispositions	61		97
Actual return on plan assets:
Gains relating to assets sold during the year	3		11
(Losses) gains relating to assets still held at year-end	8		5
Fair value of plan assets at end of year	216	[12]	265	[12]
Unfunded Status
Fair value of plan assets	216	[12]	265	[12]
Pension Plans | Derivatives
Employee Benefits
Total plan assets	17	[13]	(34)	[13]		17	[13]
Change in plan assets
Fair value of plan assets at beginning of year						17	[13]
Actual return on plan assets:
Fair value of plan assets at end of year	17	[13]	(34)	[13]		17	[13]
Unfunded Status
Fair value of plan assets	17	[13]	(34)	[13]		17	[13]
Pension Plans | Derivatives | Level 1
Employee Benefits
Total plan assets	0	[13]	0	[13]		0	[13]
Change in plan assets
Fair value of plan assets at beginning of year						0	[13]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[13]	0	[13]		0	[13]
Unfunded Status
Fair value of plan assets	0	[13]	0	[13]		0	[13]
Pension Plans | Derivatives | Level 2
Employee Benefits
Total plan assets	17	[13]	(34)	[13]		17	[13]
Change in plan assets
Fair value of plan assets at beginning of year						17	[13]
Actual return on plan assets:
Fair value of plan assets at end of year	17	[13]	(34)	[13]		17	[13]
Unfunded Status
Fair value of plan assets	17	[13]	(34)	[13]		17	[13]
Pension Plans | Derivatives | Level 3
Employee Benefits
Total plan assets	0	[13]	0	[13]		0	[13]
Change in plan assets
Fair value of plan assets at beginning of year						0	[13]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[13]	0	[13]		0	[13]
Unfunded Status
Fair value of plan assets	0	[13]	0	[13]		0	[13]
Pension Plans | Cash equivalents and short-term investment funds
Employee Benefits
Total plan assets	690	[14]	721	[14]		690	[14]
Change in plan assets
Fair value of plan assets at beginning of year						690	[14]
Actual return on plan assets:
Fair value of plan assets at end of year	690	[14]	721	[14]		690	[14]
Unfunded Status
Fair value of plan assets	690	[14]	721	[14]		690	[14]
Pension Plans | Cash equivalents and short-term investment funds | Level 1
Employee Benefits
Total plan assets	0	[14]	0	[14]		0	[14]
Change in plan assets
Fair value of plan assets at beginning of year						0	[14]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[14]	0	[14]		0	[14]
Unfunded Status
Fair value of plan assets	0	[14]	0	[14]		0	[14]
Pension Plans | Cash equivalents and short-term investment funds | Level 2
Employee Benefits
Total plan assets	690	[14]	721	[14]		690	[14]
Change in plan assets
Fair value of plan assets at beginning of year						690	[14]
Actual return on plan assets:
Fair value of plan assets at end of year	690	[14]	721	[14]		690	[14]
Unfunded Status
Fair value of plan assets	690	[14]	721	[14]		690	[14]
Pension Plans | Cash equivalents and short-term investment funds | Level 3
Employee Benefits
Total plan assets	0	[14]	0	[14]		0	[14]
Change in plan assets
Fair value of plan assets at beginning of year						0	[14]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[14]	0	[14]		0	[14]
Unfunded Status
Fair value of plan assets	0	[14]	0	[14]		0	[14]
Post-Retirement Benefit Plans
Employee Benefits
Total investments	353		534
Other items to reconcile to fair value of plan assets			1
Total plan assets	353		535		626
Change in plan assets
Fair value of plan assets at beginning of year	535		626		693
Actual return on plan assets:
Fair value of plan assets at end of year	353		535		626
Actual gains on pension and post retirement plan assets	37		45		80
Expected return	33		39		45
Unfunded Status
Benefit obligation	(3,830)		(3,688)		(4,075)			(3,930)
Fair value of plan assets	353		535		626
Unfunded status	(3,477)		(3,153)
Current portion of unfunded status	(134)		(154)
Non-current portion of unfunded status	(3,343)		(2,999)
Accumulated other comprehensive (loss) income at the beginning of the period
Net actuarial (loss) gain	(277)		(37)
Prior service (cost) benefit	163					166
Deferred income tax benefit (expense)	(171)		(78)
Total	272		122
Recognition of Net Periodic Benefits Expense
Net actuarial (loss) gain	0		4		0
Prior service (cost) benefit	(20)		0		0
Deferred income tax benefit (expense)	(8)
Net periodic (income) expense	12
Deferrals
Net actuarial (loss) gain	(240)
Prior service (cost) benefit	(23)
Deferred income tax benefit (expense)	101
Total	(162)
Net Change in AOCI
Net actuarial (loss) gain	(240)
Prior service (cost) benefit	(3)
Deferred income tax benefit (expense)	93
Total	(150)
Accumulated other comprehensive (loss) income at the end of the period
Net actuarial (loss) gain	(277)		(37)
Prior service (cost) benefit	163					166
Deferred income tax benefit (expense)	(171)		(78)
Total	272		122
Estimated recognition of net periodic benefit expense in 2013:
Net actuarial loss	0
Prior service cost	(19)
Deferred income tax benefit	7
Total	(12)
Post-Retirement Benefit Plans | Level 1
Employee Benefits
Total investments	79		135			79
Post-Retirement Benefit Plans | Level 2
Employee Benefits
Total investments	239		342			239
Post-Retirement Benefit Plans | Level 3
Employee Benefits
Total investments	35		57
Total plan assets	35		57
Change in plan assets
Fair value of plan assets at beginning of year	57		79
Acquisitions	1		1
Dispositions	25		30
Actual return on plan assets:
Gains relating to assets sold during the year	8		3
(Losses) gains relating to assets still held at year-end	(6)		4
Fair value of plan assets at end of year	35		57
Unfunded Status
Fair value of plan assets	35		57
Post-Retirement Benefit Plans | Exchange-traded U.S. equity futures
Employee Benefits
Gross notional exposure	7		16			7
Post-Retirement Benefit Plans | Exchange-traded non-U.S. equity futures
Employee Benefits
Gross notional exposure	0		0			0
Post-Retirement Benefit Plans | Exchange-traded Treasury futures
Employee Benefits
Gross notional exposure	0		0			0
Post-Retirement Benefit Plans | Interest rate swaps
Employee Benefits
Gross notional exposure	0		0			0
Post-Retirement Benefit Plans | Credit default swaps
Employee Benefits
Gross notional exposure	0		0			0
Post-Retirement Benefit Plans | Foreign exchange forwards
Employee Benefits
Gross notional exposure	13		29			13
Post-Retirement Benefit Plans | Options
Employee Benefits
Gross notional exposure	0		0			0
Post-Retirement Benefit Plans | Investment grade bonds
Employee Benefits
Total plan assets	77	[1]	77			77	[1]
Change in plan assets
Fair value of plan assets at beginning of year						77	[1]
Actual return on plan assets:
Fair value of plan assets at end of year	77	[1]	77			77	[1]
Unfunded Status
Fair value of plan assets	77	[1]	77			77	[1]
Post-Retirement Benefit Plans | Investment grade bonds | Level 1
Employee Benefits
Total plan assets	5	[1]	21			5	[1]
Change in plan assets
Fair value of plan assets at beginning of year						5	[1]
Actual return on plan assets:
Fair value of plan assets at end of year	5	[1]	21			5	[1]
Unfunded Status
Fair value of plan assets	5	[1]	21			5	[1]
Post-Retirement Benefit Plans | Investment grade bonds | Level 2
Employee Benefits
Total plan assets	72	[1]	56			72	[1]
Change in plan assets
Fair value of plan assets at beginning of year						72	[1]
Actual return on plan assets:
Fair value of plan assets at end of year	72	[1]	56			72	[1]
Unfunded Status
Fair value of plan assets	72	[1]	56			72	[1]
Post-Retirement Benefit Plans | Investment grade bonds | Level 3
Employee Benefits
Total plan assets	0	[1]	0			0	[1]
Change in plan assets
Fair value of plan assets at beginning of year						0	[1]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[1]	0			0	[1]
Unfunded Status
Fair value of plan assets	0	[1]	0			0	[1]
Post-Retirement Benefit Plans | High Yield Bonds
Employee Benefits
Total plan assets	15	[2]	56			15	[2]
Change in plan assets
Fair value of plan assets at beginning of year						15	[2]
Actual return on plan assets:
Fair value of plan assets at end of year	15	[2]	56			15	[2]
Unfunded Status
Fair value of plan assets	15	[2]	56			15	[2]
Post-Retirement Benefit Plans | High Yield Bonds | Level 1
Employee Benefits
Total plan assets	0	[2]	0			0	[2]
Change in plan assets
Fair value of plan assets at beginning of year						0	[2]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[2]	0			0	[2]
Unfunded Status
Fair value of plan assets	0	[2]	0			0	[2]
Post-Retirement Benefit Plans | High Yield Bonds | Level 2
Employee Benefits
Total plan assets	15	[2]	56			15	[2]
Change in plan assets
Fair value of plan assets at beginning of year						15	[2]
Actual return on plan assets:
Fair value of plan assets at end of year	15	[2]	56			15	[2]
Unfunded Status
Fair value of plan assets	15	[2]	56			15	[2]
Post-Retirement Benefit Plans | High Yield Bonds | Level 3
Employee Benefits
Total plan assets	0	[2]	0			0	[2]
Change in plan assets
Fair value of plan assets at beginning of year						0	[2]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[2]	0			0	[2]
Unfunded Status
Fair value of plan assets	0	[2]	0			0	[2]
Post-Retirement Benefit Plans | Emerging market bonds
Employee Benefits
Total plan assets	1	[3]	37			1	[3]
Change in plan assets
Fair value of plan assets at beginning of year						1	[3]
Actual return on plan assets:
Fair value of plan assets at end of year	1	[3]	37			1	[3]
Unfunded Status
Fair value of plan assets	1	[3]	37			1	[3]
Post-Retirement Benefit Plans | Emerging market bonds | Level 1
Employee Benefits
Total plan assets	0	[3]	0			0	[3]
Change in plan assets
Fair value of plan assets at beginning of year						0	[3]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[3]	0			0	[3]
Unfunded Status
Fair value of plan assets	0	[3]	0			0	[3]
Post-Retirement Benefit Plans | Emerging market bonds | Level 2
Employee Benefits
Total plan assets	1	[3]	37			1	[3]
Change in plan assets
Fair value of plan assets at beginning of year						1	[3]
Actual return on plan assets:
Fair value of plan assets at end of year	1	[3]	37			1	[3]
Unfunded Status
Fair value of plan assets	1	[3]	37			1	[3]
Post-Retirement Benefit Plans | Emerging market bonds | Level 3
Employee Benefits
Total plan assets	0	[3]	0			0	[3]
Change in plan assets
Fair value of plan assets at beginning of year						0	[3]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[3]	0			0	[3]
Unfunded Status
Fair value of plan assets	0	[3]	0			0	[3]
Post-Retirement Benefit Plans | Diversified strategies
Employee Benefits
Total plan assets	89	[5]	86			89	[5]
Change in plan assets
Fair value of plan assets at beginning of year						89	[5]
Actual return on plan assets:
Fair value of plan assets at end of year	89	[5]	86			89	[5]
Unfunded Status
Fair value of plan assets	89	[5]	86			89	[5]
Post-Retirement Benefit Plans | Diversified strategies | Level 1
Employee Benefits
Total plan assets	0	[5]	0			0	[5]
Change in plan assets
Fair value of plan assets at beginning of year						0	[5]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[5]	0			0	[5]
Unfunded Status
Fair value of plan assets	0	[5]	0			0	[5]
Post-Retirement Benefit Plans | Diversified strategies | Level 2
Employee Benefits
Total plan assets	89	[5]	86			89	[5]
Change in plan assets
Fair value of plan assets at beginning of year						89	[5]
Actual return on plan assets:
Fair value of plan assets at end of year	89	[5]	86			89	[5]
Unfunded Status
Fair value of plan assets	89	[5]	86			89	[5]
Post-Retirement Benefit Plans | Diversified strategies | Level 3
Employee Benefits
Total plan assets	0	[5]	0			0	[5]
Change in plan assets
Fair value of plan assets at beginning of year						0	[5]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[5]	0			0	[5]
Unfunded Status
Fair value of plan assets	0	[5]	0			0	[5]
Post-Retirement Benefit Plans | U.S. stocks
Employee Benefits
Total plan assets	35	[6]	56			35	[6]
Change in plan assets
Fair value of plan assets at beginning of year						35	[6]
Actual return on plan assets:
Fair value of plan assets at end of year	35	[6]	56			35	[6]
Unfunded Status
Fair value of plan assets	35	[6]	56			35	[6]
Post-Retirement Benefit Plans | U.S. stocks | Level 1
Employee Benefits
Total plan assets	35	[6]	56			35	[6]
Change in plan assets
Fair value of plan assets at beginning of year						35	[6]
Actual return on plan assets:
Fair value of plan assets at end of year	35	[6]	56			35	[6]
Unfunded Status
Fair value of plan assets	35	[6]	56			35	[6]
Post-Retirement Benefit Plans | U.S. stocks | Level 2
Employee Benefits
Total plan assets	0	[6]	0			0	[6]
Change in plan assets
Fair value of plan assets at beginning of year						0	[6]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[6]	0			0	[6]
Unfunded Status
Fair value of plan assets	0	[6]	0			0	[6]
Post-Retirement Benefit Plans | U.S. stocks | Level 3
Employee Benefits
Total plan assets	0	[6]	0			0	[6]
Change in plan assets
Fair value of plan assets at beginning of year						0	[6]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[6]	0			0	[6]
Unfunded Status
Fair value of plan assets	0	[6]	0			0	[6]
Post-Retirement Benefit Plans | Non-U.S. stocks
Employee Benefits
Total plan assets	33	[7]	58			33	[7]
Change in plan assets
Fair value of plan assets at beginning of year						33	[7]
Actual return on plan assets:
Fair value of plan assets at end of year	33	[7]	58			33	[7]
Unfunded Status
Fair value of plan assets	33	[7]	58			33	[7]
Post-Retirement Benefit Plans | Non-U.S. stocks | Level 1
Employee Benefits
Total plan assets	33	[7]	58			33	[7]
Change in plan assets
Fair value of plan assets at beginning of year						33	[7]
Actual return on plan assets:
Fair value of plan assets at end of year	33	[7]	58			33	[7]
Unfunded Status
Fair value of plan assets	33	[7]	58			33	[7]
Post-Retirement Benefit Plans | Non-U.S. stocks | Level 2
Employee Benefits
Total plan assets	0	[7]	0			0	[7]
Change in plan assets
Fair value of plan assets at beginning of year						0	[7]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[7]	0			0	[7]
Unfunded Status
Fair value of plan assets	0	[7]	0			0	[7]
Post-Retirement Benefit Plans | Non-U.S. stocks | Level 3
Employee Benefits
Total plan assets	0	[7]	0			0	[7]
Change in plan assets
Fair value of plan assets at beginning of year						0	[7]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[7]	0			0	[7]
Unfunded Status
Fair value of plan assets	0	[7]	0			0	[7]
Post-Retirement Benefit Plans | Emerging market stocks
Employee Benefits
Total plan assets	6	[8]	12			6	[8]
Change in plan assets
Fair value of plan assets at beginning of year						6	[8]
Actual return on plan assets:
Fair value of plan assets at end of year	6	[8]	12			6	[8]
Unfunded Status
Fair value of plan assets	6	[8]	12			6	[8]
Post-Retirement Benefit Plans | Emerging market stocks | Level 1
Employee Benefits
Total plan assets	6	[8]	0			6	[8]
Change in plan assets
Fair value of plan assets at beginning of year						6	[8]
Actual return on plan assets:
Fair value of plan assets at end of year	6	[8]	0			6	[8]
Unfunded Status
Fair value of plan assets	6	[8]	0			6	[8]
Post-Retirement Benefit Plans | Emerging market stocks | Level 2
Employee Benefits
Total plan assets	0	[8]	12			0	[8]
Change in plan assets
Fair value of plan assets at beginning of year						0	[8]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[8]	12			0	[8]
Unfunded Status
Fair value of plan assets	0	[8]	12			0	[8]
Post-Retirement Benefit Plans | Emerging market stocks | Level 3
Employee Benefits
Total plan assets	0	[8]	0			0	[8]
Change in plan assets
Fair value of plan assets at beginning of year						0	[8]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[8]	0			0	[8]
Unfunded Status
Fair value of plan assets	0	[8]	0			0	[8]
Post-Retirement Benefit Plans | Private Equity
Employee Benefits
Total plan assets	28	[9]	40			28	[9]
Change in plan assets
Fair value of plan assets at beginning of year						28	[9]
Actual return on plan assets:
Fair value of plan assets at end of year	28	[9]	40			28	[9]
Unfunded Status
Fair value of plan assets	28	[9]	40			28	[9]
Post-Retirement Benefit Plans | Private Equity | Level 1
Employee Benefits
Total plan assets	0	[9]	0			0	[9]
Change in plan assets
Fair value of plan assets at beginning of year						0	[9]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[9]	0			0	[9]
Unfunded Status
Fair value of plan assets	0	[9]	0			0	[9]
Post-Retirement Benefit Plans | Private Equity | Level 2
Employee Benefits
Total plan assets	0	[9]	0			0	[9]
Change in plan assets
Fair value of plan assets at beginning of year						0	[9]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[9]	0			0	[9]
Unfunded Status
Fair value of plan assets	0	[9]	0			0	[9]
Post-Retirement Benefit Plans | Private Equity | Level 3
Employee Benefits
Total plan assets	28	[9]	40
Change in plan assets
Fair value of plan assets at beginning of year	40		45
Acquisitions	1		1
Dispositions	15		11
Actual return on plan assets:
Gains relating to assets sold during the year	7		4
(Losses) gains relating to assets still held at year-end	(5)		1
Fair value of plan assets at end of year	28	[9]	40
Unfunded Status
Fair value of plan assets	28	[9]	40
Post-Retirement Benefit Plans | Private Debt
Employee Benefits
Total plan assets	3	[10]	5			3	[10]
Change in plan assets
Fair value of plan assets at beginning of year						3	[10]
Actual return on plan assets:
Fair value of plan assets at end of year	3	[10]	5			3	[10]
Unfunded Status
Fair value of plan assets	3	[10]	5			3	[10]
Post-Retirement Benefit Plans | Private Debt | Level 1
Employee Benefits
Total plan assets	0	[10]	0			0	[10]
Change in plan assets
Fair value of plan assets at beginning of year						0	[10]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[10]	0			0	[10]
Unfunded Status
Fair value of plan assets	0	[10]	0			0	[10]
Post-Retirement Benefit Plans | Private Debt | Level 2
Employee Benefits
Total plan assets	0	[10]	0			0	[10]
Change in plan assets
Fair value of plan assets at beginning of year						0	[10]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[10]	0			0	[10]
Unfunded Status
Fair value of plan assets	0	[10]	0			0	[10]
Post-Retirement Benefit Plans | Private Debt | Level 3
Employee Benefits
Total plan assets	3	[10]	5
Change in plan assets
Fair value of plan assets at beginning of year	5		6
Acquisitions	0		0
Dispositions	2		1
Actual return on plan assets:
Gains relating to assets sold during the year	1		0
(Losses) gains relating to assets still held at year-end	(1)		0
Fair value of plan assets at end of year	3	[10]	5
Unfunded Status
Fair value of plan assets	3	[10]	5
Post-Retirement Benefit Plans | Market Neutral Hedge Funds
Employee Benefits
Total plan assets	25	[11]	35			25	[11]
Change in plan assets
Fair value of plan assets at beginning of year						25	[11]
Actual return on plan assets:
Fair value of plan assets at end of year	25	[11]	35			25	[11]
Unfunded Status
Fair value of plan assets	25	[11]	35			25	[11]
Post-Retirement Benefit Plans | Market Neutral Hedge Funds | Level 1
Employee Benefits
Total plan assets	0	[11]	0			0	[11]
Change in plan assets
Fair value of plan assets at beginning of year						0	[11]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[11]	0			0	[11]
Unfunded Status
Fair value of plan assets	0	[11]	0			0	[11]
Post-Retirement Benefit Plans | Market Neutral Hedge Funds | Level 2
Employee Benefits
Total plan assets	25	[11]	35			25	[11]
Change in plan assets
Fair value of plan assets at beginning of year						25	[11]
Actual return on plan assets:
Fair value of plan assets at end of year	25	[11]	35			25	[11]
Unfunded Status
Fair value of plan assets	25	[11]	35			25	[11]
Post-Retirement Benefit Plans | Market Neutral Hedge Funds | Level 3
Employee Benefits
Total plan assets	0	[11]	0			0	[11]
Change in plan assets
Fair value of plan assets at beginning of year						0	[11]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[11]	0			0	[11]
Unfunded Status
Fair value of plan assets	0	[11]	0			0	[11]
Post-Retirement Benefit Plans | Directional Hedge Funds
Employee Benefits
Total plan assets	1	[11]	14			1	[11]
Change in plan assets
Fair value of plan assets at beginning of year						1	[11]
Actual return on plan assets:
Fair value of plan assets at end of year	1	[11]	14			1	[11]
Unfunded Status
Fair value of plan assets	1	[11]	14			1	[11]
Post-Retirement Benefit Plans | Directional Hedge Funds | Level 1
Employee Benefits
Total plan assets	0	[11]	0			0	[11]
Change in plan assets
Fair value of plan assets at beginning of year						0	[11]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[11]	0			0	[11]
Unfunded Status
Fair value of plan assets	0	[11]	0			0	[11]
Post-Retirement Benefit Plans | Directional Hedge Funds | Level 2
Employee Benefits
Total plan assets	1	[11]	14			1	[11]
Change in plan assets
Fair value of plan assets at beginning of year						1	[11]
Actual return on plan assets:
Fair value of plan assets at end of year	1	[11]	14			1	[11]
Unfunded Status
Fair value of plan assets	1	[11]	14			1	[11]
Post-Retirement Benefit Plans | Directional Hedge Funds | Level 3
Employee Benefits
Total plan assets	0	[11]	0			0	[11]
Change in plan assets
Fair value of plan assets at beginning of year						0	[11]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[11]	0			0	[11]
Unfunded Status
Fair value of plan assets	0	[11]	0			0	[11]
Post-Retirement Benefit Plans | Real Estate
Employee Benefits
Total plan assets	28	[12]	34			28	[12]
Change in plan assets
Fair value of plan assets at beginning of year						28	[12]
Actual return on plan assets:
Fair value of plan assets at end of year	28	[12]	34			28	[12]
Unfunded Status
Fair value of plan assets	28	[12]	34			28	[12]
Post-Retirement Benefit Plans | Real Estate | Level 1
Employee Benefits
Total plan assets	0	[12]	0			0	[12]
Change in plan assets
Fair value of plan assets at beginning of year						0	[12]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[12]	0			0	[12]
Unfunded Status
Fair value of plan assets	0	[12]	0			0	[12]
Post-Retirement Benefit Plans | Real Estate | Level 2
Employee Benefits
Total plan assets	24	[12]	22			24	[12]
Change in plan assets
Fair value of plan assets at beginning of year						24	[12]
Actual return on plan assets:
Fair value of plan assets at end of year	24	[12]	22			24	[12]
Unfunded Status
Fair value of plan assets	24	[12]	22			24	[12]
Post-Retirement Benefit Plans | Real Estate | Level 3
Employee Benefits
Total plan assets	4	[12]	12
Change in plan assets
Fair value of plan assets at beginning of year	12		28
Acquisitions	0		0
Dispositions	8		18
Actual return on plan assets:
Gains relating to assets sold during the year	0		(1)
(Losses) gains relating to assets still held at year-end	0		3
Fair value of plan assets at end of year	4	[12]	12
Unfunded Status
Fair value of plan assets	4	[12]	12
Post-Retirement Benefit Plans | Cash equivalents and short-term investment funds
Employee Benefits
Total plan assets	12	[14]	24			12	[14]
Change in plan assets
Fair value of plan assets at beginning of year						12	[14]
Actual return on plan assets:
Fair value of plan assets at end of year	12	[14]	24			12	[14]
Unfunded Status
Fair value of plan assets	12	[14]	24			12	[14]
Post-Retirement Benefit Plans | Cash equivalents and short-term investment funds | Level 1
Employee Benefits
Total plan assets	0	[14]	0			0	[14]
Change in plan assets
Fair value of plan assets at beginning of year						0	[14]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[14]	0			0	[14]
Unfunded Status
Fair value of plan assets	0	[14]	0			0	[14]
Post-Retirement Benefit Plans | Cash equivalents and short-term investment funds | Level 2
Employee Benefits
Total plan assets	12	[14]	24			12	[14]
Change in plan assets
Fair value of plan assets at beginning of year						12	[14]
Actual return on plan assets:
Fair value of plan assets at end of year	12	[14]	24			12	[14]
Unfunded Status
Fair value of plan assets	12	[14]	24			12	[14]
Post-Retirement Benefit Plans | Cash equivalents and short-term investment funds | Level 3
Employee Benefits
Total plan assets	0	[14]	0			0	[14]
Change in plan assets
Fair value of plan assets at beginning of year						0	[14]
Actual return on plan assets:
Fair value of plan assets at end of year	0	[14]	0			0	[14]
Unfunded Status
Fair value of plan assets	$ 0	[14]	$ 0			$ 0	[14]

[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 described above. The commingled funds can be redeemed at NAV within a year of the financial statement date and are classified as Level 2.

[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 classified as Level 2. The commingled funds are valued at NAV based on the market value of the underlying high yield instruments using the same valuation inputs described above. Commingled funds that can be redeemed at NAV within a year of the financial statement date are classified as Level 2. Commingled funds that cannot be redeemed at NAV or that cannot be redeemed at NAV within a year of the financial statement date are classified as Level 3.

[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. These securities are classified as Level 2. The commingled funds are valued at NAV based on the market value of the underlying emerging market bonds using the same valuation inputs described above. The commingled funds can be redeemed at NAV within a year of the financial statement date and are classified as Level 2. The registered mutual funds trade at the daily NAV, as determined by the market value of the underlying investments, and are classified as Level 1.

[4] Convertible bonds primarily represent investments in corporate debt securities that have features that allow the debt to be converted into equity securities under certain circumstances. The valuation inputs for the individual convertible bonds primarily utilize observable market information including a spread to U.S. Treasuries and the value and volatility of the underlying equity security. Convertible bonds are classified as Level 2.

[5] Diversified strategies represent an investment in a commingled fund that primarily has exposures to global government, corporate and inflation linked bonds, global stocks and commodities. The commingled fund is valued at NAV based on the market value of the underlying investments. The valuation inputs utilize observable market information including published prices for exchange traded securities, bid prices for government bonds, and spreads and yields available for comparable fixed income securities with similar credit ratings. This fund can be redeemed at NAV within a year of the financial statement date and is classified as Level 2.

[6] 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 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 described above. These commingled funds can be redeemed at NAV within a year of the financial statement date and are classified as Level 2.

[7] 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 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 described above. These commingled funds can be redeemed at NAV within a year of the financial statement date and are classified as Level 2.

[8] Emerging market stocks represent investments in a registered mutual fund and commingled funds comprised of stocks of companies located in developing markets. Registered mutual funds trade at the daily NAV, as determined by the market value of the underlying investments, and are 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 described previously for individual stocks. These commingled funds can be redeemed at NAV within a year of the financial statement date and are classified as Level 2.

[9] Private equity represents non-public investments in domestic and foreign buy out and venture capital funds. Private equity funds are structured as limited partnerships and are valued according to the valuation policy of each partnership, subject to prevailing accounting and other regulatory guidelines. The partnerships use valuation methodologies that give consideration to a range of factors, including but not limited to the price at which investments were acquired, the nature of the investments, market conditions, trading values on comparable public securities, current and projected operating performance, and financing transactions subsequent to the acquisition of the investments. These valuation methodologies involve a significant degree of judgment. Private equity investments are classified as Level 3.

[10] Private debt represents non-public investments in distressed or mezzanine debt funds. Mezzanine debt instruments are debt instruments that are subordinated to other debt issues and may include embedded equity instruments such as warrants. Private debt funds are structured as limited partnerships and are valued according to the valuation policy of each partnership, subject to prevailing accounting and other regulatory guidelines. The valuation of underlying fund investments are based on factors including the issuer's current and projected credit worthiness, the security's terms, reference to the securities of comparable companies, and other market factors. These valuation methodologies involve a significant degree of judgment. Private debt investments are classified as Level 3.

[11] Market neutral hedge funds hold investments in a diversified mix of instruments that are intended in combination to exhibit low correlations to market fluctuations. These investments are typically combined with futures to achieve uncorrelated excess returns over various markets. Directional hedge funds—This asset category represents investments that may exhibit somewhat higher correlations to market fluctuations than the market neutral hedge funds. Investments in hedge funds include both direct investments and investments in diversified funds of funds. Hedge Funds are valued at NAV based on the market value of the underlying investments which include publicly traded equity and fixed income securities and privately negotiated debt securities. The hedge funds are valued by third party administrators using the same valuation inputs previously described. Hedge funds that can be redeemed at NAV within a year of the financial statement date are classified as Level 2. Hedge fund investments that cannot be redeemed at NAV or that cannot be redeemed at NAV within a year of the financial statement date are classified as Level 3.

[12] Real estate represents investments in commingled funds and limited partnerships that invest in a diversified portfolio of real estate properties. These investments are valued at NAV according to the valuation policy of each fund or partnership, subject to prevailing accounting and other regulatory guidelines. The valuation inputs of the underlying properties are generally based on third-party appraisals that use comparable sales or a projection of future cash flows to determine fair value. Real estate investments that can be redeemed at NAV within a year of the financial statement date are classified as Level 2. Real estate investments that cannot be redeemed at NAV or that cannot be redeemed at NAV within a year of the financial statement date are classified as Level 3.

[13] Derivatives include exchange traded futures contracts, as well as privately negotiated over-the-counter swaps and options that are valued based on the change in interest rates or a specific market index and are classified as Level 2. The market values represent gains or losses that occur due to fluctuations in interest rates, foreign currency exchange rates, security prices, or other factors.

[14] 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 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. These commingled funds can be redeemed at NAV within a year of the financial statement date and are classified as Level 2.