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Employee Postretirement Benefits (Pension Plan Assets of the Principal Plans Measured at fair value) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan, Accumulated Benefit Obligation	$ 3,847	$ 6,696
Defined Benefit Pension Plans
Defined Benefit Plan, Benefit Obligation	3,959	6,860	$ 6,164
Fair value of plan assets	3,508	5,914	$ 5,567
Principal Plans
Defined Benefit Plan, Benefit Obligation	3,295	6,312
Defined Benefit Plan, Accumulated Benefit Obligation	3,253	6,221
Fair value of plan assets	3,019	5,559
Principal Plans \| Fair Value, Inputs, Level 1
Fair value of plan assets	241	161
Principal Plans \| Fair Value, Inputs, Level 2
Fair value of plan assets	2,778	5,398
Principal Plans \| Fair Value, Inputs, Level 3
Fair value of plan assets	0	0
Principal Plans \| U.S. Equity
Fair value of plan assets	58
Principal Plans \| U.S. Equity \| Mutual and Pooled Funds
Fair value of plan assets		4
Principal Plans \| U.S. Equity \| Fair Value, Inputs, Level 1
Fair value of plan assets	58
Principal Plans \| U.S. Equity \| Fair Value, Inputs, Level 1 \| Mutual and Pooled Funds
Fair value of plan assets		4
Principal Plans \| U.S. Equity \| Fair Value, Inputs, Level 2
Fair value of plan assets	0
Principal Plans \| U.S. Equity \| Fair Value, Inputs, Level 2 \| Mutual and Pooled Funds
Fair value of plan assets		0
Principal Plans \| U.S. Equity \| Fair Value, Inputs, Level 3
Fair value of plan assets	0
Principal Plans \| U.S. Equity \| Fair Value, Inputs, Level 3 \| Mutual and Pooled Funds
Fair value of plan assets		0
Principal Plans \| International Equity
Fair value of plan assets	30
Principal Plans \| International Equity \| Fair Value, Inputs, Level 1
Fair value of plan assets	30
Principal Plans \| International Equity \| Fair Value, Inputs, Level 2
Fair value of plan assets	0
Principal Plans \| International Equity \| Fair Value, Inputs, Level 3
Fair value of plan assets	0
Principal Plans \| Non-U.S. Equity \| Mutual and Pooled Funds
Fair value of plan assets	67	106
Principal Plans \| Non-U.S. Equity \| Fair Value, Inputs, Level 1 \| Mutual and Pooled Funds
Fair value of plan assets	0	1
Principal Plans \| Non-U.S. Equity \| Fair Value, Inputs, Level 2 \| Mutual and Pooled Funds
Fair value of plan assets	67	105
Principal Plans \| Non-U.S. Equity \| Fair Value, Inputs, Level 3 \| Mutual and Pooled Funds
Fair value of plan assets	0	0
Principal Plans \| International Bonds \| Mutual and Pooled Funds
Fair value of plan assets	1,236	1,438
Principal Plans \| International Bonds \| Fair Value, Inputs, Level 1 \| Mutual and Pooled Funds
Fair value of plan assets	0	0
Principal Plans \| International Bonds \| Fair Value, Inputs, Level 2 \| Mutual and Pooled Funds
Fair value of plan assets	1,236	1,438
Principal Plans \| International Bonds \| Fair Value, Inputs, Level 3 \| Mutual and Pooled Funds
Fair value of plan assets	0	0
Principal Plans \| U.S. securitized fixed income
Fair value of plan assets		6
Principal Plans \| U.S. securitized fixed income \| Fair Value, Inputs, Level 1
Fair value of plan assets		0
Principal Plans \| U.S. securitized fixed income \| Fair Value, Inputs, Level 2
Fair value of plan assets		6
Principal Plans \| U.S. securitized fixed income \| Fair Value, Inputs, Level 3
Fair value of plan assets		0
Principal Plans \| Cash and Cash Equivalents
Fair value of plan assets	14	28
Principal Plans \| Cash and Cash Equivalents \| Mutual and Pooled Funds
Fair value of plan assets	34	175
Principal Plans \| Cash and Cash Equivalents \| Fair Value, Inputs, Level 1
Fair value of plan assets	12	28
Principal Plans \| Cash and Cash Equivalents \| Fair Value, Inputs, Level 1 \| Mutual and Pooled Funds
Fair value of plan assets	0	9
Principal Plans \| Cash and Cash Equivalents \| Fair Value, Inputs, Level 2
Fair value of plan assets	2	0
Principal Plans \| Cash and Cash Equivalents \| Fair Value, Inputs, Level 2 \| Mutual and Pooled Funds
Fair value of plan assets	34	166
Principal Plans \| Cash and Cash Equivalents \| Fair Value, Inputs, Level 3
Fair value of plan assets	0	0
Principal Plans \| Cash and Cash Equivalents \| Fair Value, Inputs, Level 3 \| Mutual and Pooled Funds
Fair value of plan assets	0	0
Principal Plans \| U.S. government and municipals
Fair value of plan assets	157	252
Principal Plans \| U.S. government and municipals \| Mutual and Pooled Funds
Fair value of plan assets	149
Principal Plans \| U.S. government and municipals \| Fair Value, Inputs, Level 1
Fair value of plan assets	141	71
Principal Plans \| U.S. government and municipals \| Fair Value, Inputs, Level 1 \| Mutual and Pooled Funds
Fair value of plan assets	0
Principal Plans \| U.S. government and municipals \| Fair Value, Inputs, Level 2
Fair value of plan assets	16	181
Principal Plans \| U.S. government and municipals \| Fair Value, Inputs, Level 2 \| Mutual and Pooled Funds
Fair value of plan assets	149
Principal Plans \| U.S. government and municipals \| Fair Value, Inputs, Level 3
Fair value of plan assets	0	0
Principal Plans \| U.S. government and municipals \| Fair Value, Inputs, Level 3 \| Mutual and Pooled Funds
Fair value of plan assets	0
Principal Plans \| U.S. corporate debt
Fair value of plan assets	21	2,167
Principal Plans \| U.S. corporate debt \| Mutual and Pooled Funds
Fair value of plan assets	623	149
Principal Plans \| U.S. corporate debt \| Fair Value, Inputs, Level 1
Fair value of plan assets	0	0
Principal Plans \| U.S. corporate debt \| Fair Value, Inputs, Level 1 \| Mutual and Pooled Funds
Fair value of plan assets	0	0
Principal Plans \| U.S. corporate debt \| Fair Value, Inputs, Level 2
Fair value of plan assets	21	2,167
Principal Plans \| U.S. corporate debt \| Fair Value, Inputs, Level 2 \| Mutual and Pooled Funds
Fair value of plan assets	623	149
Principal Plans \| U.S. corporate debt \| Fair Value, Inputs, Level 3
Fair value of plan assets	0	0
Principal Plans \| U.S. corporate debt \| Fair Value, Inputs, Level 3 \| Mutual and Pooled Funds
Fair value of plan assets	0	0
Principal Plans \| Multi-sector \| Mutual and Pooled Funds
Fair value of plan assets		1
Principal Plans \| Multi-sector \| Fair Value, Inputs, Level 1 \| Mutual and Pooled Funds
Fair value of plan assets		1
Principal Plans \| Multi-sector \| Fair Value, Inputs, Level 2 \| Mutual and Pooled Funds
Fair value of plan assets		0
Principal Plans \| Multi-sector \| Fair Value, Inputs, Level 3 \| Mutual and Pooled Funds
Fair value of plan assets		0
Principal Plans \| Global equity \| Mutual and Pooled Funds
Fair value of plan assets	630	1,186
Principal Plans \| Global equity \| Fair Value, Inputs, Level 1 \| Mutual and Pooled Funds
Fair value of plan assets	0	0
Principal Plans \| Global equity \| Fair Value, Inputs, Level 2 \| Mutual and Pooled Funds
Fair value of plan assets	630	1,186
Principal Plans \| Global equity \| Fair Value, Inputs, Level 3 \| Mutual and Pooled Funds
Fair value of plan assets	$ 0	0
Principal Plans \| Insurance Contract
Fair value of plan assets		29
Principal Plans \| Insurance Contract \| Fair Value, Inputs, Level 3
Fair value of plan assets		0
Principal Plans \| Equity - Held Through Mutual and Pooled Funds \| Fair Value, Inputs, Level 1
Fair value of plan assets		29
Principal Plans \| Equity - Held Through Mutual and Pooled Funds \| Fair Value, Inputs, Level 2
Fair value of plan assets		0
U.S. Equity \| Equity - Assets Held Directly
Fair value of plan assets		18
U.S. Equity \| Equity - Assets Held Directly \| Fair Value, Inputs, Level 1
Fair value of plan assets		18
U.S. Equity \| Equity - Assets Held Directly \| Fair Value, Inputs, Level 2
Fair value of plan assets		0
U.S. Equity \| Equity - Assets Held Directly \| Fair Value, Inputs, Level 3
Fair value of plan assets		$ 0