Employee Benefits (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2013		Dec. 31, 2010
Actual return on plan assets:
Actual gains on pension and post retirement plan assets	$ 855		$ 1,556
Expected return	935		892
Difference between the actual and expected returns on pension and post-retirement plan assets	80		664
Unfunded Status
Non-current portion of unfunded status	(4,049)		(5,844)
Accumulated other comprehensive (loss) income at the beginning of the period
Total	791		1,688
Recognition of Net Periodic Benefits Expense
Net periodic (income) expense	58
Deferrals
Total	839
Net Change in AOCI
Total	897
Accumulated other comprehensive (loss) income at the end of the period
Total	791		1,688
Health Care and Life Insurance
Active health care benefit expenses	362		360		377
Participating management employees' contribution to health care plan	117		113		90
Pension Plans
Employee Benefits
Total investments	12,346		12,333
Accrued expenses	0		(12)
Total plan assets	12,346		12,321		11,814
Change in plan assets
Fair value of plan assets at beginning of year	12,321		11,814		3,732
Acquisitions	0		0		7,777
Actual return on plan assets:
Fair value of plan assets at end of year	12,346		12,321		11,814
Actual gains on pension and post retirement plan assets	810		1,476		479
Expected return	896		847		709	[1]
Unfunded Status
Benefit obligation	(13,401)		(14,881)		(13,596)				(4,534)
Fair value of plan assets	12,346		12,321		11,814
Unfunded status	(1,055)		(2,560)
Current portion of unfunded status	(5)		(6)
Non-current portion of unfunded status	(1,050)		(2,554)
Accumulated other comprehensive (loss) income at the beginning of the period
Net actuarial (loss) gain	(1,058)		(2,236)
Prior service (cost) benefit	38						33
Deferred income tax benefit (expense)	(422)		(875)
Total	669		1,399
Recognition of Net Periodic Benefits Expense
Net actuarial (loss) gain	84		35		13	[1]
Prior service (cost) benefit	(5)		(4)		(2)	[1]
Deferred income tax benefit (expense)	(34)
Net periodic (income) expense	55
Deferrals
Net actuarial (loss) gain	1,094
Prior service (cost) benefit	0
Deferred income tax benefit (expense)	(419)
Total	675
Net Change in AOCI
Net actuarial (loss) gain	1,178
Prior service (cost) benefit	5
Deferred income tax benefit (expense)	(453)
Total	730
Accumulated other comprehensive (loss) income at the end of the period
Net actuarial (loss) gain	(1,058)		(2,236)
Prior service (cost) benefit	38						33
Deferred income tax benefit (expense)	(422)		(875)
Total	669		1,399
Estimated recognition of net periodic benefit expense in 2013:
Net actuarial loss	(17)
Prior service cost	(5)
Deferred income tax benefit	8
Total	(14)
Pension Plans | Level 1
Employee Benefits
Total investments	3,576		3,572				3,576
Pension Plans | Level 2
Employee Benefits
Total investments	7,191		6,995				7,191
Pension Plans | Level 3
Employee Benefits
Total investments	1,579		1,766
Total plan assets	1,579		1,766
Change in plan assets
Fair value of plan assets at beginning of year	1,766		2,237
Net transfers	(165)		(305)
Acquisitions	267		209
Dispositions	(464)		(343)
Actual return on plan assets:
Gains (losses) relating to assets sold during the year	109		4
Gains (losses) relating to assets still held at year-end	66		(36)
Fair value of plan assets at end of year	1,579		1,766
Unfunded Status
Fair value of plan assets	1,579		1,766
Pension Plans | Exchange-traded U.S. equity futures
Employee Benefits
Gross notional exposure	95		302				95
Pension Plans | Exchange-traded non-U.S. equity futures
Employee Benefits
Gross notional exposure	0		1				0
Pension Plans | Exchange-traded Treasury futures
Employee Benefits
Gross notional exposure	3,011		1,763				3,011
Pension Plans | Interest rate swaps
Employee Benefits
Gross notional exposure	556		1,471				556
Pension Plans | Total Return Swap [Member]
Employee Benefits
Gross notional exposure	253						253
Pension Plans | Credit default swaps
Employee Benefits
Gross notional exposure			495
Pension Plans | Foreign exchange forwards
Employee Benefits
Gross notional exposure	938		726				938
Pension Plans | Options
Employee Benefits
Gross notional exposure	261		768				261
Pension Plans | Investment grade bonds
Employee Benefits
Total investments	2,317	[2]	2,385	[2]			2,317	[2]
Pension Plans | Investment grade bonds | Level 1
Employee Benefits
Total investments	813	[2]	830	[2]			813	[2]
Pension Plans | Investment grade bonds | Level 2
Employee Benefits
Total investments	1,504	[2]	1,555	[2]			1,504	[2]
Pension Plans | Investment grade bonds | Level 3
Employee Benefits
Total investments	0	[2]	0	[2]			0	[2]
Pension Plans | High Yield Bonds
Employee Benefits
Total investments	1,291	[3]	1,362	[3]			1,291	[3]
Pension Plans | High Yield Bonds | Level 1
Employee Benefits
Total investments	0	[3]	0	[3]			0	[3]
Pension Plans | High Yield Bonds | Level 2
Employee Benefits
Total investments	1,265	[3]	1,303	[3]			1,265	[3]
Pension Plans | High Yield Bonds | Level 3
Employee Benefits
Total investments	26	[3]	59	[3]
Total plan assets	26		59
Change in plan assets
Fair value of plan assets at beginning of year	59		79
Net transfers	0		(12)
Acquisitions	5		1
Dispositions	(43)		(11)
Actual return on plan assets:
Gains (losses) relating to assets sold during the year	12		0
Gains (losses) relating to assets still held at year-end	(7)		2
Fair value of plan assets at end of year	26		59
Unfunded Status
Fair value of plan assets	26		59
Pension Plans | Emerging market bonds
Employee Benefits
Total investments	563	[4]	595	[4]			563	[4]
Pension Plans | Emerging market bonds | Level 1
Employee Benefits
Total investments	196	[4]	199	[4]			196	[4]
Pension Plans | Emerging market bonds | Level 2
Employee Benefits
Total investments	367	[4]	396	[4]			367	[4]
Pension Plans | Emerging market bonds | Level 3
Employee Benefits
Total investments	0	[4]	0	[4]			0	[4]
Pension Plans | Convertible bonds
Employee Benefits
Total investments	389	[5]	374	[5]			389	[5]
Pension Plans | Convertible bonds | Level 1
Employee Benefits
Total investments	0	[5]	0	[5]			0	[5]
Pension Plans | Convertible bonds | Level 2
Employee Benefits
Total investments	389	[5]	374	[5]			389	[5]
Pension Plans | Convertible bonds | Level 3
Employee Benefits
Total investments	0	[5]	0	[5]			0	[5]
Pension Plans | Diversified strategies
Employee Benefits
Total investments	723	[6]	655	[6]			723	[6]
Pension Plans | Diversified strategies | Level 1
Employee Benefits
Total investments	0	[6]	0	[6]			0	[6]
Pension Plans | Diversified strategies | Level 2
Employee Benefits
Total investments	723	[6]	655	[6]			723	[6]
Pension Plans | Diversified strategies | Level 3
Employee Benefits
Total investments	0	[6]	0	[6]			0	[6]
Pension Plans | U.S. stocks
Employee Benefits
Total investments	1,500	[7]	1,344	[7]			1,500	[7]
Pension Plans | U.S. stocks | Level 1
Employee Benefits
Total investments	1,408	[7]	1,225	[7]			1,408	[7]
Pension Plans | U.S. stocks | Level 2
Employee Benefits
Total investments	92	[7]	119	[7]			92	[7]
Pension Plans | U.S. stocks | Level 3
Employee Benefits
Total investments	0	[7]	0	[7]			0	[7]
Pension Plans | Non-U.S. stocks
Employee Benefits
Total investments	1,458	[8]	1,390	[8]			1,458	[8]
Pension Plans | Non-U.S. stocks | Level 1
Employee Benefits
Total investments	1,159	[8]	1,212	[8]			1,159	[8]
Pension Plans | Non-U.S. stocks | Level 2
Employee Benefits
Total investments	299	[8]	178	[8]			299	[8]
Pension Plans | Non-U.S. stocks | Level 3
Employee Benefits
Total investments	0	[8]	0	[8]			0	[8]
Pension Plans | Emerging market stocks
Employee Benefits
Total investments	110	[9]	304	[9]			110	[9]
Pension Plans | Emerging market stocks | Level 1
Employee Benefits
Total investments	0	[9]	111	[9]			0	[9]
Pension Plans | Emerging market stocks | Level 2
Employee Benefits
Total investments	110	[9]	193	[9]			110	[9]
Pension Plans | Emerging market stocks | Level 3
Employee Benefits
Total investments	0	[9]	0	[9]			0	[9]
Pension Plans | Private Equity
Employee Benefits
Total investments	721	[10]					721	[10]
Pension Plans | Private Equity | Level 1
Employee Benefits
Total investments	0	[10]	0	[10]			0	[10]
Pension Plans | Private Equity | Level 2
Employee Benefits
Total investments	0	[10]	0	[10]			0	[10]
Pension Plans | Private Equity | Level 3
Employee Benefits
Total investments	721	[10]	711	[10]
Total plan assets	721		711
Change in plan assets
Fair value of plan assets at beginning of year	711		791
Net transfers	0		0
Acquisitions	82		70
Dispositions	(179)		(109)
Actual return on plan assets:
Gains (losses) relating to assets sold during the year	68		3
Gains (losses) relating to assets still held at year-end	39		(44)
Fair value of plan assets at end of year	721		711
Unfunded Status
Fair value of plan assets	721		711
Pension Plans | Private Debt
Employee Benefits
Total investments	436	[11]					436	[11]
Pension Plans | Private Debt | Level 1
Employee Benefits
Total investments	0	[11]	0	[11]			0	[11]
Pension Plans | Private Debt | Level 2
Employee Benefits
Total investments	0	[11]	0	[11]			0	[11]
Pension Plans | Private Debt | Level 3
Employee Benefits
Total investments	436	[11]	465	[11]
Total plan assets	436		465
Change in plan assets
Fair value of plan assets at beginning of year	465		461
Net transfers	0		0
Acquisitions	71		120
Dispositions	(144)		(102)
Actual return on plan assets:
Gains (losses) relating to assets sold during the year	18		1
Gains (losses) relating to assets still held at year-end	26		(15)
Fair value of plan assets at end of year	436		465
Unfunded Status
Fair value of plan assets	436		465
Pension Plans | Market Neutral Hedge Funds
Employee Benefits
Total investments	966	[12]	906	[12]			966	[12]
Pension Plans | Market Neutral Hedge Funds | Level 1
Employee Benefits
Total investments	0	[12]	0	[12]			0	[12]
Pension Plans | Market Neutral Hedge Funds | Level 2
Employee Benefits
Total investments	867	[12]	906	[12]			867	[12]
Pension Plans | Market Neutral Hedge Funds | Level 3
Employee Benefits
Total investments	99	[12]	0	[12]
Total plan assets	99		0
Change in plan assets
Fair value of plan assets at beginning of year	0		188
Net transfers	0		(188)
Acquisitions	100		0
Dispositions	0		0
Actual return on plan assets:
Gains (losses) relating to assets sold during the year	0		0
Gains (losses) relating to assets still held at year-end	(1)		0
Fair value of plan assets at end of year	99		0
Unfunded Status
Fair value of plan assets	99		0
Pension Plans | Directional Hedge Funds
Employee Benefits
Total investments	614	[12]	534	[12]			614	[12]
Pension Plans | Directional Hedge Funds | Level 1
Employee Benefits
Total investments	0	[12]	0	[12]			0	[12]
Pension Plans | Directional Hedge Funds | Level 2
Employee Benefits
Total investments	582	[12]	340	[12]			582	[12]
Pension Plans | Directional Hedge Funds | Level 3
Employee Benefits
Total investments	32	[12]	194	[12]
Total plan assets	32		194
Change in plan assets
Fair value of plan assets at beginning of year	194		183
Net transfers	(165)		0
Acquisitions	0		0
Dispositions	(1)		0
Actual return on plan assets:
Gains (losses) relating to assets sold during the year	0		0
Gains (losses) relating to assets still held at year-end	4		11
Fair value of plan assets at end of year	32		194
Unfunded Status
Fair value of plan assets	32		194
Pension Plans | Real Estate
Employee Benefits
Total investments	571	[13]	560	[13]			571	[13]
Pension Plans | Real Estate | Level 1
Employee Benefits
Total investments	0	[13]	0	[13]			0	[13]
Pension Plans | Real Estate | Level 2
Employee Benefits
Total investments	306	[13]	223	[13]			306	[13]
Pension Plans | Real Estate | Level 3
Employee Benefits
Total investments	265	[13]	337	[13]
Total plan assets	265		337
Change in plan assets
Fair value of plan assets at beginning of year	337		535
Net transfers	0		(105)
Acquisitions	9		18
Dispositions	(97)		(121)
Actual return on plan assets:
Gains (losses) relating to assets sold during the year	11		0
Gains (losses) relating to assets still held at year-end	5		10
Fair value of plan assets at end of year	265		337
Unfunded Status
Fair value of plan assets	265		337
Pension Plans | Derivatives
Employee Benefits
Total investments	(34)	[14]	(2)	[14]			(34)	[14]
Pension Plans | Derivatives | Level 1
Employee Benefits
Total investments	0	[14]	(5)	[14]			0	[14]
Pension Plans | Derivatives | Level 2
Employee Benefits
Total investments	(34)	[14]	3	[14]			(34)	[14]
Pension Plans | Derivatives | Level 3
Employee Benefits
Total investments	0	[14]	0	[14]			0	[14]
Pension Plans | Cash equivalents and short-term investment funds
Employee Benefits
Total investments	721	[15]	750	[15]			721	[15]
Pension Plans | Cash equivalents and short-term investment funds | Level 1
Employee Benefits
Total investments	0	[15]	0	[15]			0	[15]
Pension Plans | Cash equivalents and short-term investment funds | Level 2
Employee Benefits
Total investments	721	[15]	750	[15]			721	[15]
Pension Plans | Cash equivalents and short-term investment funds | Level 3
Employee Benefits
Total investments	0	[15]	0	[15]			0	[15]
Post-Retirement Benefit Plans
Employee Benefits
Total investments	534		637
Accrued expenses	1		(1)
Reimbursement accrual			(10)
Total plan assets	535		626		693
Change in plan assets
Fair value of plan assets at beginning of year	626		693		54
Acquisitions	0		0		768
Actual return on plan assets:
Fair value of plan assets at end of year	535		626		693
Actual gains on pension and post retirement plan assets	45		80		4
Expected return	39		45		41
Unfunded Status
Benefit obligation	(3,688)		(4,075)		(3,930)				(558)
Fair value of plan assets	535		626		693
Unfunded status	(3,153)		(3,449)
Current portion of unfunded status	(154)		(160)
Non-current portion of unfunded status	(2,999)		(3,289)
Accumulated other comprehensive (loss) income at the beginning of the period
Net actuarial (loss) gain	(37)		(446)
Prior service (cost) benefit	22						163
Deferred income tax benefit (expense)	(78)		(179)
Total	122		289
Recognition of Net Periodic Benefits Expense
Net actuarial (loss) gain	4		0		0
Prior service (cost) benefit	0		0		2
Deferred income tax benefit (expense)	(1)
Net periodic (income) expense	3
Deferrals
Net actuarial (loss) gain	405
Prior service (cost) benefit	(141)
Deferred income tax benefit (expense)	(100)
Total	164
Net Change in AOCI
Net actuarial (loss) gain	409
Prior service (cost) benefit	(141)
Deferred income tax benefit (expense)	(101)
Total	167
Accumulated other comprehensive (loss) income at the end of the period
Net actuarial (loss) gain	(37)		(446)
Prior service (cost) benefit	22						163
Deferred income tax benefit (expense)	(78)		(179)
Total	122		289
Estimated recognition of net periodic benefit expense in 2013:
Net actuarial loss	0
Prior service cost	(17)
Deferred income tax benefit	6
Total	(11)
Post-Retirement Benefit Plans | Level 1
Employee Benefits
Total investments	135		140				135
Post-Retirement Benefit Plans | Level 2
Employee Benefits
Total investments	342		418				342
Post-Retirement Benefit Plans | Level 3
Employee Benefits
Total investments	57		79
Total plan assets	57		79
Change in plan assets
Fair value of plan assets at beginning of year	79		94
Acquisitions	1		1
Dispositions	(30)		(19)
Actual return on plan assets:
Gains (losses) relating to assets sold during the year	3		5
Gains (losses) relating to assets still held at year-end	4		(2)
Fair value of plan assets at end of year	57		79
Unfunded Status
Fair value of plan assets	57		79
Post-Retirement Benefit Plans | Exchange-traded U.S. equity futures
Employee Benefits
Gross notional exposure	16		30				16
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	29		21				29
Post-Retirement Benefit Plans | Options
Employee Benefits
Gross notional exposure	0		0				0
Post-Retirement Benefit Plans | Investment grade bonds
Employee Benefits
Total investments	77	[2]	108	[2]			77	[2]
Post-Retirement Benefit Plans | Investment grade bonds | Level 1
Employee Benefits
Total investments	21	[2]	22	[2]			21	[2]
Post-Retirement Benefit Plans | Investment grade bonds | Level 2
Employee Benefits
Total investments	56	[2]	86	[2]			56	[2]
Post-Retirement Benefit Plans | Investment grade bonds | Level 3
Employee Benefits
Total investments	0	[2]	0	[2]			0	[2]
Post-Retirement Benefit Plans | High Yield Bonds
Employee Benefits
Total investments	56	[3]	90	[3]			56	[3]
Post-Retirement Benefit Plans | High Yield Bonds | Level 1
Employee Benefits
Total investments	0	[3]	0	[3]			0	[3]
Post-Retirement Benefit Plans | High Yield Bonds | Level 2
Employee Benefits
Total investments	56	[3]	90	[3]			56	[3]
Post-Retirement Benefit Plans | High Yield Bonds | Level 3
Employee Benefits
Total investments	0	[3]	0	[3]			0	[3]
Post-Retirement Benefit Plans | Emerging market bonds
Employee Benefits
Total investments	37	[4]	40	[4]			37	[4]
Post-Retirement Benefit Plans | Emerging market bonds | Level 1
Employee Benefits
Total investments	0	[4]	0	[4]			0	[4]
Post-Retirement Benefit Plans | Emerging market bonds | Level 2
Employee Benefits
Total investments	37	[4]	40	[4]			37	[4]
Post-Retirement Benefit Plans | Emerging market bonds | Level 3
Employee Benefits
Total investments	0	[4]	0	[4]			0	[4]
Post-Retirement Benefit Plans | Convertible bonds
Employee Benefits
Total investments			2	[5]
Post-Retirement Benefit Plans | Convertible bonds | Level 1
Employee Benefits
Total investments			0	[5]
Post-Retirement Benefit Plans | Convertible bonds | Level 2
Employee Benefits
Total investments			2	[5]
Post-Retirement Benefit Plans | Convertible bonds | Level 3
Employee Benefits
Total investments			0	[5]
Post-Retirement Benefit Plans | Diversified strategies
Employee Benefits
Total investments	86	[6]	72	[6]			86	[6]
Post-Retirement Benefit Plans | Diversified strategies | Level 1
Employee Benefits
Total investments	0	[6]	0	[6]			0	[6]
Post-Retirement Benefit Plans | Diversified strategies | Level 2
Employee Benefits
Total investments	86	[6]	72	[6]			86	[6]
Post-Retirement Benefit Plans | Diversified strategies | Level 3
Employee Benefits
Total investments	0	[6]	0	[6]			0	[6]
Post-Retirement Benefit Plans | U.S. stocks
Employee Benefits
Total investments	56	[7]	55	[7]			56	[7]
Post-Retirement Benefit Plans | U.S. stocks | Level 1
Employee Benefits
Total investments	56	[7]	55	[7]			56	[7]
Post-Retirement Benefit Plans | U.S. stocks | Level 2
Employee Benefits
Total investments	0	[7]	0	[7]			0	[7]
Post-Retirement Benefit Plans | U.S. stocks | Level 3
Employee Benefits
Total investments	0	[7]	0	[7]			0	[7]
Post-Retirement Benefit Plans | Non-U.S. stocks
Employee Benefits
Total investments	58	[8]	59	[8]			58	[8]
Post-Retirement Benefit Plans | Non-U.S. stocks | Level 1
Employee Benefits
Total investments	58	[8]	58	[8]			58	[8]
Post-Retirement Benefit Plans | Non-U.S. stocks | Level 2
Employee Benefits
Total investments	0	[8]	1	[8]			0	[8]
Post-Retirement Benefit Plans | Non-U.S. stocks | Level 3
Employee Benefits
Total investments	0	[8]	0	[8]			0	[8]
Post-Retirement Benefit Plans | Emerging market stocks
Employee Benefits
Total investments	12	[9]	20	[9]			12	[9]
Post-Retirement Benefit Plans | Emerging market stocks | Level 1
Employee Benefits
Total investments	0	[9]	0	[9]			0	[9]
Post-Retirement Benefit Plans | Emerging market stocks | Level 2
Employee Benefits
Total investments	12	[9]	20	[9]			12	[9]
Post-Retirement Benefit Plans | Emerging market stocks | Level 3
Employee Benefits
Total investments	0	[9]	0	[9]			0	[9]
Post-Retirement Benefit Plans | Private Equity
Employee Benefits
Total investments	40	[10]	45	[10]			40	[10]
Post-Retirement Benefit Plans | Private Equity | Level 1
Employee Benefits
Total investments	0	[10]	0	[10]			0	[10]
Post-Retirement Benefit Plans | Private Equity | Level 2
Employee Benefits
Total investments	0	[10]	0	[10]			0	[10]
Post-Retirement Benefit Plans | Private Equity | Level 3
Employee Benefits
Total investments	40	[10]	45	[10]
Total plan assets	40		45
Change in plan assets
Fair value of plan assets at beginning of year	45		60
Acquisitions	1		1
Dispositions	(11)		(15)
Actual return on plan assets:
Gains (losses) relating to assets sold during the year	4		4
Gains (losses) relating to assets still held at year-end	1		(5)
Fair value of plan assets at end of year	40		45
Unfunded Status
Fair value of plan assets	40		45
Post-Retirement Benefit Plans | Private Debt
Employee Benefits
Total investments	5	[11]	6	[11]			5	[11]
Post-Retirement Benefit Plans | Private Debt | Level 1
Employee Benefits
Total investments	0	[11]	0	[11]			0	[11]
Post-Retirement Benefit Plans | Private Debt | Level 2
Employee Benefits
Total investments	0	[11]	0	[11]			0	[11]
Post-Retirement Benefit Plans | Private Debt | Level 3
Employee Benefits
Total investments	5	[11]	6	[11]
Total plan assets	5		6
Change in plan assets
Fair value of plan assets at beginning of year	6		8
Acquisitions	0		0
Dispositions	(1)		(3)
Actual return on plan assets:
Gains (losses) relating to assets sold during the year	0		2
Gains (losses) relating to assets still held at year-end	0		(1)
Fair value of plan assets at end of year	5		6
Unfunded Status
Fair value of plan assets	5		6
Post-Retirement Benefit Plans | Market Neutral Hedge Funds
Employee Benefits
Total investments	35	[12]	41	[12]			35	[12]
Post-Retirement Benefit Plans | Market Neutral Hedge Funds | Level 1
Employee Benefits
Total investments	0	[12]	0	[12]			0	[12]
Post-Retirement Benefit Plans | Market Neutral Hedge Funds | Level 2
Employee Benefits
Total investments	35	[12]	41	[12]			35	[12]
Post-Retirement Benefit Plans | Market Neutral Hedge Funds | Level 3
Employee Benefits
Total investments	0	[12]	0	[12]			0	[12]
Post-Retirement Benefit Plans | Directional Hedge Funds
Employee Benefits
Total investments	14	[12]	24	[12]			14	[12]
Post-Retirement Benefit Plans | Directional Hedge Funds | Level 1
Employee Benefits
Total investments	0	[12]	0	[12]			0	[12]
Post-Retirement Benefit Plans | Directional Hedge Funds | Level 2
Employee Benefits
Total investments	14	[12]	24	[12]			14	[12]
Post-Retirement Benefit Plans | Directional Hedge Funds | Level 3
Employee Benefits
Total investments	0	[12]	0	[12]			0	[12]
Post-Retirement Benefit Plans | Real Estate
Employee Benefits
Total investments	34	[13]	49	[13]			34	[13]
Post-Retirement Benefit Plans | Real Estate | Level 1
Employee Benefits
Total investments	0	[13]	0	[13]			0	[13]
Post-Retirement Benefit Plans | Real Estate | Level 2
Employee Benefits
Total investments	22	[13]	21	[13]			22	[13]
Post-Retirement Benefit Plans | Real Estate | Level 3
Employee Benefits
Total investments	12	[13]	28	[13]
Total plan assets	12		28
Change in plan assets
Fair value of plan assets at beginning of year	28		26
Acquisitions	0		0
Dispositions	(18)		(1)
Actual return on plan assets:
Gains (losses) relating to assets sold during the year	(1)		(1)
Gains (losses) relating to assets still held at year-end	3		4
Fair value of plan assets at end of year	12		28
Unfunded Status
Fair value of plan assets	12		28
Post-Retirement Benefit Plans | Cash equivalents and short-term investment funds
Employee Benefits
Total investments	24	[15]	26	[15]			24	[15]
Post-Retirement Benefit Plans | Cash equivalents and short-term investment funds | Level 1
Employee Benefits
Total investments	0	[15]	5	[15]			0	[15]
Post-Retirement Benefit Plans | Cash equivalents and short-term investment funds | Level 2
Employee Benefits
Total investments	24	[15]	21	[15]			24	[15]
Post-Retirement Benefit Plans | Cash equivalents and short-term investment funds | Level 3
Employee Benefits
Total investments	$ 0	[15]	$ 0	[15]			$ 0	[15]

[1] Includes $58 million of income related to the Qwest plans subsequent to the April 1, 2011 acquisition date.

[2] nvestment 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.

[3] 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.

[4] 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.

[5] 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.

[6] 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.

[7] 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.

[8] 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.

[9] 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.

[10] 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.

[11] 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.

[12] 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.

[13] 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.

[14] Derivatives include the market value of exchange traded futures contracts which are classified as Level 1, 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 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.

[15] ash 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. U.S. Treasury Bills 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 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.