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Fair Value of Pension Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 8,534	$ 6,817
Investments measured at net asset value	2,439	2,667
Total investments at fair value	10,973	9,484
Pension Plans | U.S. Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	2	1
Pension Plans | Non-U.S. Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	5	427
Pension Plans | Pooled Funds - Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	2,340	1,524
Pension Plans | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	2,347	1,952
Pension Plans | Government Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	3,237	3,009
Pension Plans | Pooled Funds - Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	602	756
Pension Plans | Corporate Bonds And Other Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	2,102	852
Pension Plans | Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	5,941	4,617
Pension Plans | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	156	170
Pension Plans | Private Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	2	2
Pension Plans | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	86	73
Pension Plans | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	2	3
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1,658	1,382
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | U.S. Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	2	1
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Non-U.S. Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	5	427
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Pooled Funds - Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	848	286
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	855	714
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Government Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	34	37
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Pooled Funds - Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	449	103
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Corporate Bonds And Other Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	133	357
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	616	497
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	120	98
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Private Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	66	72
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1	1
Significant Other Observable Inputs (Level 2) | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	6,060	4,833
Significant Other Observable Inputs (Level 2) | Pension Plans | U.S. Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Significant Other Observable Inputs (Level 2) | Pension Plans | Non-U.S. Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Significant Other Observable Inputs (Level 2) | Pension Plans | Pooled Funds - Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1,492	1,235
Significant Other Observable Inputs (Level 2) | Pension Plans | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1,492	1,235
Significant Other Observable Inputs (Level 2) | Pension Plans | Government Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	3,203	2,972
Significant Other Observable Inputs (Level 2) | Pension Plans | Pooled Funds - Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	153	618
Significant Other Observable Inputs (Level 2) | Pension Plans | Corporate Bonds And Other Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1,179	(43)
Significant Other Observable Inputs (Level 2) | Pension Plans | Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	4,535	3,547
Significant Other Observable Inputs (Level 2) | Pension Plans | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	13	50
Significant Other Observable Inputs (Level 2) | Pension Plans | Private Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Significant Other Observable Inputs (Level 2) | Pension Plans | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	20	1
Significant Other Observable Inputs (Level 2) | Pension Plans | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	816	602	$ 924
Significant Unobservable Inputs (Level 3) | Non-U.S. Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	3	0
Significant Unobservable Inputs (Level 3) | Pooled Funds - Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	35	26
Significant Unobservable Inputs (Level 3) | Corporate Bonds And Other Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	790	538	665
Significant Unobservable Inputs (Level 3) | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	23	22	$ 230
Significant Unobservable Inputs (Level 3) | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	816	602
Significant Unobservable Inputs (Level 3) | Pension Plans | U.S. Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Significant Unobservable Inputs (Level 3) | Pension Plans | Non-U.S. Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Significant Unobservable Inputs (Level 3) | Pension Plans | Pooled Funds - Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	3
Significant Unobservable Inputs (Level 3) | Pension Plans | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	3
Significant Unobservable Inputs (Level 3) | Pension Plans | Government Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Significant Unobservable Inputs (Level 3) | Pension Plans | Pooled Funds - Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	35
Significant Unobservable Inputs (Level 3) | Pension Plans | Corporate Bonds And Other Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	790	538
Significant Unobservable Inputs (Level 3) | Pension Plans | Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	790	573
Significant Unobservable Inputs (Level 3) | Pension Plans | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	23	22
Significant Unobservable Inputs (Level 3) | Pension Plans | Private Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	2	2
Significant Unobservable Inputs (Level 3) | Pension Plans | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Significant Unobservable Inputs (Level 3) | Pension Plans | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 1	$ 2

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+ References

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